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Rondorfite

A valid IMA mineral species

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Rondorfite, etc.

Caspar quarry, Ettringen, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany

Rondorfite, etc.

Caspar quarry, Ettringen, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany

Rondorfite, etc.

Caspar quarry, Ettringen, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany

Rondorfite, etc.

Caspar quarry, Ettringen, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany

Rondorfite, etc.

Caspar quarry, Ettringen, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany

Rondorfite, etc.

Caspar quarry, Ettringen, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany

Rondorfite, etc.

Caspar quarry, Ettringen, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany

Rondorfite, etc.

Caspar quarry, Ettringen, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany

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About RondorfiteHide

From left to right Eugene Rondorf (rondorfite), Elsa Horváth (horváthite-(Y)), Alice Rondorf (rondorfite), Franz-Josef Emmerich (emmerichite) and Jochen Tschörtner (tschörtnerite).

Caspar quarry, Ettringen, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany

Formula:

Ca₈Mg(SiO₄)₄Cl₂

Colour:

orange brown to amber, rarely green

Lustre:

Vitreous, Sub-Vitreous

Specific Gravity:

3.03 (Calculated)

Crystal System:

Isometric

Name:

Named in honour of Alice and Eugen Rondorf, of Neuwied, Germany, mineral collectors who discovered the mineral with Bernd Ternes in 1979. They also discovered the mineral almarudite.

Type Locality:

ⓘ Caspar quarry, Ettringen, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany

Rondorfite grains are anhedral, < 0.3 mm in diameter, and show orange brown to amber color, vitreous luster, and a light amber streak. The color difference results from different O/Cl ratio. The orange color results from (1) Fe³⁺/Al substitution for Mg, (2) presence of atypical MgO₄ tetrahedron, or (3) electronegativity. Non-equilibrium Cl positions and the presence of Ca-Cl bonds are confirmed (Dulski et al., 2015).

An Al-bearing, triclinic-pseudocubic variant was described by Rastsvetaeva et al. (2008).

Unique IdentifiersHide

Mindat ID:

25682

Long-form identifier:

mindat:1:1:25682:7

IMA Classification of RondorfiteHide

IMA status:

Approved

Approval year:

1997

First published:

2004

Type description reference:

Mihajlović, Tamara, Lengauer, Christian L., Ntaflos, Theodoros, Kolitsch, Uwe, Tillmanns, Ekkehart (2004) Two new minerals, rondorfite, Ca₈Mg[SiO₄]₄Cl₂, and almarudite, K(□,Na)₂(Mn,Fe,Mg)₂(Be,Al)₃[Si₁₂O₃₀], and a study of iron-rich wadalite, Ca₁₂[(Al₈Si₄Fe₂)O₃₂]Cl₆, from the Bellerberg (Bellberg) volcano, Eifel, Germany. Neues Jahrbuch für Mineralogie - Abhandlungen, 179 (3). 265-294 doi:10.1127/0077-7757/2004/0179-0265

Classification of RondorfiteHide

Strunz-mindat (2026):

9.AB.20

9 : SILICATES (Germanates)
A : Nesosilicates
B : Nesosilicates without additional anions; cations in [4] and greater coordination

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Symbol	Source	Reference for Standard
Ron	IMA–CNMNC	Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of RondorfiteHide

Lustre:

Vitreous, Sub-Vitreous

Transparency:

Transparent, Translucent

Colour:

Orange brown to amber, rarely green

Streak:

Pale yellow

Tenacity:

Brittle

Cleavage:

None Observed

Fracture:

Conchoidal

Density:

3.03 g/cm³ (Calculated)

Optical Data of RondorfiteHide

Type:

Isotropic

RI values:

n = 1.676

Birefringence:

0.0

Surface Relief:

Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).

This shows the grain boundary and Becke line effect under plane-polarised light, based on the contrast between this mineral's average refractive index and the mounting medium. It does not take into account mineral colouration.

Focus:

In focus

Pleochroism:

Non-pleochroic

Chemistry of RondorfiteHide

Mindat Formula:

Ca₈Mg(SiO₄)₄Cl₂

Element Weights:

Element	% weight
Ca	40.887 %
O	32.645 %
Si	14.326 %
Cl	9.042 %
Mg	3.100 %

Calculated from ideal end-member formula.

Elements listed:

Ca, Cl, Mg, O, Si - search for minerals with similar chemistry

Crystallography of RondorfiteHide

Crystal System:

Isometric

Class (H-M):

m3(2/m3) - Diploidal

Space Group:

Fd3

Setting:

F2/d3

Cell Parameters:

a = 15.0850(3) Å

Unit Cell V:

3,432.70 Å³ (Calculated from Unit Cell)

Comment:

Cubic or Triclinic. Point Group: 2/m 3 or 1.: Space Group: F2/d3 . a = 15.0850(3) Z = 8 or Space Group: P1 . a = 15.100(2) b = 15.110(2) c = 15.092(2) α = 90.06(1)° β = 90.01(1)° γ = 89.93(1)° Z = 8

Crystal StructureHide

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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure

ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0012395	Rondorfite	Rastsvetaeva R K, Zadov A E, Chukanov N V (2008) Crystal structure of low-symmetry rondorfite Crystallography Reports 53 199-205		2008	Kabardino-Balkarian Republic, Northern Caucasus Region, Russia	0	293
0014723	Rondorfite	Mihajlovic T, Lengauer C L, Ntaflos T, Lolitsch U, Tillmanns E (2004) Two new minerals, rondorfite, Ca8Mg[SiO4]4Cl2, and almarudite, K(box,Na)2(Mn,Fe,Mg)2(Be,Al)3[Si12O30], and a study of iron-rich wadalite, Ca12[(Al8Si4Fe2)O32]C16, from the Bellerberg (Bellberg) volcano, Eifel, Germany Eastern Eifel volcanic area, Eifel, Germany Neues Jahrbuch fur Mineralogie, Abhandlungen 179 265-294		2004	Bellerberg volcano lava field, 2 km N of Mayen,	0	293

CIF Raw Data - click here to close

data_global
_chemical_name_mineral 'Rondorfite'
loop_
_publ_author_name
'Rastsvetaeva R K'
'Zadov A E'
'Chukanov N V'
_journal_name_full 'Crystallography Reports'
_journal_volume 53 
_journal_year 2008
_journal_page_first 199
_journal_page_last 205
_publ_section_title
;
 Crystal structure of low-symmetry rondorfite
;
_database_code_amcsd 0012395
_chemical_compound_source 'Kabardino-Balkarian Republic, Northern Caucasus Region, Russia'
_chemical_formula_sum 'Ca8 Mg Si4 O16 Cl2'
_cell_length_a 15.100
_cell_length_b 15.110
_cell_length_c 15.092
_cell_angle_alpha 90.06
_cell_angle_beta 90.01
_cell_angle_gamma 89.93
_cell_volume 3443.401
_exptl_crystal_density_diffrn      3.025
_symmetry_space_group_name_H-M 'P 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
Ca1   0.24540   0.99480   0.49400   0.00899
Ca2   0.74810   0.99110  -0.00620   0.02318
Ca3   0.23990   0.49540  -0.00290   0.02609
Ca4   0.73800   0.49430   0.49620   0.02419
Ca5  -0.00520   0.74570  -0.00830   0.00671
Ca6  -0.00520   0.49150   0.24410   0.00684
Ca7   0.49840   0.24030  -0.00330   0.02292
Ca8   0.49530   0.73910   0.49690   0.02634
Ca9  -0.00370   0.23900   0.49690   0.02761
Ca10   0.49560   0.49320   0.74060   0.03065
Ca11   0.49650   0.99470   0.24190   0.02723
Ca12  -0.00460   0.99760   0.74000   0.02419
Ca13   0.24390   0.24320   0.74230   0.01165
Ca14   0.74380   0.74330   0.74390   0.02204
Ca15   0.24150   0.74430   0.24510   0.02799
Ca16   0.74330   0.24010   0.24230   0.02723
Ca17   0.90140   0.61710   0.61780   0.02368
Ca18   0.61910   0.61850   0.90380   0.02356
Ca19   0.40370   0.11810   0.61920   0.01786
Ca20   0.40320   0.61790   0.11830   0.01634
Ca21   0.11960   0.11780   0.90230   0.01925
Ca22   0.90250   0.11780   0.11830   0.01621
Ca23   0.11790   0.61830   0.40170   0.01697
Ca24   0.61800   0.11650   0.40210   0.01570
Ca25   0.11850   0.40340   0.61900   0.02812
Ca26   0.11900   0.90210   0.11870   0.01798
Ca27   0.61740   0.90180   0.61730   0.01494
Ca28   0.61930   0.40200   0.11830   0.01570
Ca29   0.11970   0.33420   0.11850   0.01305
Ca30   0.61860   0.33340   0.61770   0.02394
Ca31   0.11620   0.83290   0.61870   0.02343
Ca32   0.61830   0.83220   0.11860   0.02216
Ca33   0.33350   0.11820   0.11930   0.01355
Ca34   0.83330   0.61720   0.11750   0.02305
Ca35   0.83360   0.11730   0.61800   0.02432
Ca36   0.33550   0.61710   0.61740   0.02533
Ca37   0.11790   0.11910   0.33430   0.01039
Ca38   0.11800   0.61600   0.83350   0.02394
Ca39   0.61910   0.11860   0.83330   0.02444
Ca40   0.61830   0.61530   0.33320   0.02356
Ca41   0.36850   0.36760   0.15360   0.02634
Ca42   0.86790   0.36770   0.65310   0.02596
Ca43   0.86890   0.86670   0.15100   0.02520
Ca44   0.36750   0.86770   0.65200   0.02495
Ca45   0.36930   0.65270   0.86840   0.02166
Ca46   0.86770   0.15280   0.87110   0.02647
Ca47   0.65270   0.36790   0.86830   0.02710
Ca48   0.15170   0.86850   0.86860   0.02318
Ca49   0.15270   0.36680   0.36820   0.02520
Ca50   0.36760   0.15170   0.36770   0.02685
Ca51   0.86830   0.65060   0.36640   0.02419
Ca52   0.65350   0.86680   0.36720   0.02280
Ca53   0.36810   0.08430   0.87050   0.02216
Ca54   0.86960   0.08280   0.36790   0.02672
Ca55   0.86860   0.58340   0.86640   0.02976
Ca56   0.36810   0.58390   0.36780   0.02748
Ca57   0.37070   0.36760   0.58420   0.02305
Ca58   0.87000   0.36770   0.08280   0.03179
Ca59   0.58470   0.36790   0.36920   0.02470
Ca60   0.08300   0.86810   0.36820   0.02774
Ca61   0.08370   0.36680   0.86810   0.02862
Ca62   0.36760   0.86720   0.08400   0.02748
Ca63   0.86670   0.86850   0.58370   0.02495
Ca64   0.58460   0.86800   0.86840   0.02799
Mg1   0.87240   0.36780   0.87000   0.01368
Mg2   0.86690   0.86790   0.36920   0.02571
Mg3   0.36480   0.36690   0.36850   0.02406
Mg4   0.36690   0.86820   0.86780   0.02786
Mg5   0.12090   0.61840   0.62050   0.00646
Mg6   0.11990   0.11850   0.11600   0.01330
Mg7   0.61490   0.11590   0.62070   0.02153
Mg8   0.61500   0.61700   0.11870   0.02786
Si1   0.00410   0.50140  -0.00390   0.01089
Si2   0.00450   0.00290   0.50380   0.01583
Si3   0.50530   0.50310   0.50890   0.02634
Si4   0.50440   0.00440   0.00340   0.01178
Si5   0.25890   0.97830   0.25780   0.03306
Si6   0.75480   0.48400   0.25050   0.00861
Si7   0.25400   0.48380   0.75290   0.01254
Si8   0.75090   0.98760   0.75260   0.01279
Si9   0.98010   0.25710   0.25590   0.01456
Si10   0.48630   0.25200   0.75320   0.00456
Sil1   0.75420   0.75570   0.98440   0.01456
Si12   0.98410   0.75100   0.75420   0.02698
Si13   0.25540   0.25400   0.98190   0.00912
Si14   0.75260   0.25210   0.48490   0.02508
Si15   0.25360   0.74630   0.48990   0.02913
Si16   0.48940   0.75100   0.25030   0.02622
Si17   0.50870   0.23030   0.23210   0.01418
Si18   0.00130   0.73280   0.23320   0.02153
Si19   0.00080   0.23750   0.73710   0.02204
Si20   0.50330   0.73690   0.73660   0.02267
Si21   0.22900   0.72970   0.00570   0.00671
Si22   0.73820   0.73680   0.50290   0.02191
Si23   0.73640   0.23580   0.00280   0.02140
Si24   0.24160   0.23460   0.50170   0.02609
Si25   0.23080   0.00640   0.72830   0.00760
Si26   0.23590   0.50250   0.23500   0.02280
Si27   0.73960   0.50020   0.73760   0.02850
Si28   0.73890   0.00010   0.23910   0.02660
Si29   0.48030   0.47900  -0.02010   0.00887
Si30  -0.01280   0.48250   0.48110   0.01963
Si31   0.48540  -0.01540   0.48440   0.03724
Si32  -0.00910   0.99130  -0.00880   0.01241
O1   0.26300   0.04020   0.34930   0.02153
O2   0.93750   0.44540   0.94650   0.02280
O3   0.84480   0.26120   0.54230   0.01520
O4   0.84860   0.76310   0.03420   0.01773
O5   0.93840   0.93680   0.44150   0.02406
O6   0.44110   0.93850   0.94360   0.02660
O7   0.76190   0.53880   0.34480   0.02280
O8   0.34310   0.76580   0.54220   0.02660
O9   0.76470   0.03790   0.84680   0.01900
O10   0.09470   0.72760   0.29100   0.02153
O11   0.64290   0.01140   0.29110   0.02280
O12   0.26140   0.53900   0.84600   0.02660
O13   0.34830   0.26100   0.03830   0.01773
O14   0.59460   0.51310   0.44600   0.02153
O15   0.04000   0.34750   0.26510   0.01013
O16   0.43810   0.43930   0.43860   0.02406
O17   0.54270   0.83820   0.25950   0.02026
O18   0.03400   0.84510   0.76190   0.02913
O19   0.54140   0.34690   0.76160   0.03040
O20   0.29100   0.64060   0.01070   0.02153
O21   0.78900   0.14080   0.01290   0.02406
O22   0.22350   0.28940   0.59590   0.01773
O23   0.09400   0.22150   0.79090   0.01900
O24   0.14330   0.51610   0.29050   0.02786
O25   0.64330   0.51120   0.79010   0.02026
O26   0.59870   0.21910   0.28930   0.02280
O27   0.00900   0.28780   0.64230   0.02280
O28   0.78910   0.64330   0.51470   0.02280
O29   0.59310   0.72290   0.78400   0.03040
O30   0.51600   0.78710   0.64090   0.02660
O31   0.14280   0.01360   0.78480   0.01900
O32   0.51720   0.28800   0.14560   0.02153
O33   0.21990   0.78950   0.09470   0.02533
O34   0.09710   0.51080   0.94630   0.01140
O35   0.51210   0.94680   0.09160   0.02660
O36   0.01740   0.78590   0.13930   0.02026
O37   0.28740   0.14130   0.51420   0.02026
O38   0.72380   0.78990   0.59130   0.02660
O39   0.14320   0.21970   0.45340   0.02660
O40   0.72390   0.28970   0.09380   0.02153
O41   0.51210   0.44640   0.59480   0.01520
O42   0.89340   0.97260   0.04160   0.01900
O43   0.39470   0.76180   0.19690   0.02533
O44   0.79220   0.09260   0.22550   0.02153
O45   0.94960   0.59180   0.01030   0.02786
O46   0.97800   0.04320   0.89030   0.02026
O47   0.29340   0.08890   0.72120   0.02406
O48   0.89260   0.76410   0.69640   0.01773
O49   0.69040   0.04660   0.68880   0.03040
O50   0.76470   0.19700   0.38990   0.01900
O51   0.26670   0.19810   0.89270   0.02533
O52   0.63960   0.22020   0.94350   0.02153
O53   0.97380   0.53820   0.39330   0.02533
O54   0.01810   0.44720   0.09320   0.02153
O55   0.59460   0.01530   0.94600   0.03546
O56   0.18860   0.54290   0.68700   0.02026
O57   0.94690   0.64280   0.22260   0.02406
O58   0.19820   0.88920   0.26550   0.02153
O59   0.53850   0.39010   0.97400   0.02153
O60   0.44690   0.59330   0.51890   0.02026
O61   0.14680   0.72330   0.94300   0.02533
O62   0.78670   0.59360   0.72060   0.01900
O63   0.47070   0.03680   0.38720   0.02913
O64   0.04170   0.89040   0.97260   0.02533
O65   0.39220   0.47250   0.03600   0.02786
O66   0.68890   0.54660   0.19250   0.02660
O67   0.09210   0.01750   0.44600   0.02786
O68   0.69550   0.89300   0.76180   0.02153
O69   0.44750   0.14090   0.22210   0.02153
O70   0.19570   0.04350   0.18940   0.02533
O71   0.89200   0.47360   0.53900   0.02913
O72   0.44640   0.64050   0.72120   0.03040
O73   0.38760   0.26040   0.69740   0.02280
O74   0.76000   0.69870   0.88990   0.02913
O75   0.03890   0.39160   0.47160   0.01267
O76   0.39030   0.97470   0.53710   0.02026
O77   0.47070   0.53710   0.89120   0.02533
O78   0.19870   0.39100   0.76310   0.02280
O79   0.64320   0.72480   0.44650   0.02913
O80   0.01230   0.94500   0.59490   0.02660
O81   0.44440   0.29580   0.29620   0.02913
O82   0.89410   0.26480   0.19510   0.02913
O83   0.79780   0.43980   0.79720   0.02660
O84   0.72300   0.94370   0.14130   0.02406
O85   0.94910   0.14100   0.72080   0.02280
O86   0.44560   0.09540   0.01210   0.03420
O87   0.79580   0.93830   0.29430   0.02406
O88   0.29920   0.29490   0.44170   0.02406
O89   0.29830   0.93490   0.79820   0.02533
O90   0.94630   0.09230   0.51190   0.02533
O91   0.84890   0.97060   0.69820   0.02533
O92   0.34570   0.97140   0.19240   0.01393
O93   0.18880   0.68730   0.54310   0.02533
O94   0.70150   0.38550   0.26230   0.02913
O95   0.84510   0.47340   0.19850   0.02406
O96   0.29320   0.59780   0.22500   0.02280
O97   0.20010   0.34350   0.97030   0.02913
O98   0.79970   0.29700   0.94290   0.03040
O99   0.79430   0.79930   0.43730   0.02406
O100   0.19820   0.84430   0.48020   0.02026
O101   0.68940   0.19140   0.54790   0.03293
O102   0.29700   0.44020   0.29360   0.03293
O103   0.54150   0.88750   0.47620   0.02786
O104   0.94070   0.29400   0.78990   0.02533
O105   0.19000   0.18750   0.04570   0.02280
O106   0.29360   0.79300   0.93860   0.03166
O107   0.69390   0.84380   0.96960   0.02280
O108   0.72300   0.44830   0.64260   0.02786
O109   0.47450   0.19550   0.84530   0.02026
O110   0.21950   0.94500   0.64850   0.02280
O111   0.47160   0.69400   0.34600   0.02026
O112   0.93870   0.79420   0.29730   0.03040
O113   0.34530   0.47490   0.69840   0.03420
O114   0.97590   0.19640   0.34160   0.02660
O115   0.26050   0.69570   0.39020   0.02280
O116   0.43810   0.79470   0.80060   0.02026
O117   0.54660   0.18720   0.69270   0.02026
O118   0.22460   0.44830   0.14210   0.02533
O119   0.04760   0.18700   0.18450   0.02406
O120   0.69490   0.34700   0.47020   0.02280
O121   0.69290   0.69240   0.04910   0.02026
O122   0.97670   0.69320   0.84750   0.02786
O123   0.04550   0.54690   0.55160   0.02660
O124   0.53950   0.68870   0.18600   0.03293
O125   0.04850   0.04490   0.04720   0.02280
O126   0.54100   0.05390   0.54700   0.02786
O127   0.05130   0.68990   0.69260   0.02026
O128   0.54490   0.54180   0.04950   0.02153
Cl1   0.74050   0.74220   0.23890   0.02280
Cl2   0.74460   0.24290   0.74410   0.02748
Cl3   0.24660   0.74160   0.74560   0.02698
Cl4   0.24670   0.24650   0.24880   0.02432
Cl5   0.74090   0.49450   0.99240   0.02153
Cl6   0.74310   0.99070   0.49430   0.02533
Cl7   0.98900   0.49080   0.74100   0.02457
Cl8   0.24680   0.99180   0.99390   0.02976
Cl9   0.49040   0.49280   0.24500   0.02482
Cl10   0.24770   0.48960   0.49170   0.02951
Cl11  -0.00580   0.24270   0.99650   0.02546
Cl12  -0.00210   0.98920   0.24470   0.02558
Cl13  -0.00710   0.74420   0.49140   0.02837
Cl14   0.49400   0.99070   0.74540   0.02761
Cl15   0.49410   0.74230   0.99410   0.02318
Cl16   0.48960   0.24510   0.48820   0.02799

X-Ray Powder DiffractionHide

Powder Diffraction Data:

d-spacing	Intensity
8.669 Å	(20)
5.323 Å	(15)
4.545 Å	(20)
4.365 Å	(5)
3.767 Å	(5)
3.074 Å	(15)
2.901 Å	(40)
2.666 Å	(100)
2.549 Å	(30)
2.383 Å	(10)
2.302 Å	(15)
2.272 Å	(15)
2.111. Å	(20)
1.964 Å	(30)
1.885 Å	(30)
1.844 Å	(5)
1.777 Å	(30)
1.742 Å	(20)
1.688 Å	(5)
1.580 Å	(5)
1.540 Å	(50)
1.459 Å	(30)
1.333 Å	(15)
1.224 Å	(10)
1.193 Å	(20)
1.154 Å	(20)
1.020 Å	(10)
1.008 Å	(10)

Locality:

Caspar quarry, Ettringen, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany

Reference:

Comments:

Mihajlović, T., C. L. Lengauer, T. Ntaflos, U. Kolitsch and E. Tillmanns (2004) Two new minerals rondorfite, Ca8Mg[SiO4]4Cl2, and almarudite, K(ٱ,Na)2(Mn,Fe,Mg)2(Be,Al)3[Si12O30], and a study of iron-rich wadalite, Ca12[(Al8Si4Fe2)O32]Cl6, from the Bellerberg (Bellberg) volcano, Eifel, Germany. Neues Jahrbuch für Mineralogie, Abhandlungen: 179: 265-294.

Geological EnvironmentHide

Paragenetic Mode(s):

Paragenetic Mode	Earliest Age (Ga)
Stage 7: Great Oxidation Event	<2.4
45b : [Other oxidized fumarolic minerals]
Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere	<0.6
50 : Coal and/or oil shale minerals	<0.36
Stage 10b: Anthropogenic minerals	<10 Ka
54 : Coal and other mine fire minerals (see also #51 and #56)

Type Occurrence of RondorfiteHide

Type Locality:

ⓘ Caspar quarry, Ettringen, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany

General Appearance of Type Material:

minute grains to 0.5 mm

Place of Conservation of Type Material:

The Natural History Museum, Vienna, Austria.

Geological Setting of Type Material:

thermally altered calcium-rich xenolites in rocks contacting leucite-rich lava slags

Associated Minerals at Type Locality:

Chlormayenite	Cuspidine	'Ellestadite'	Ettringite	'Fayalite-Forsterite Series'
Hematite	Hydrocalumite	Larnite	Magnetite	Portlandite
Quartz	Ternesite	Thaumasite	Tobermorite

Reference:

Synonyms of RondorfiteHide

IMA1997-013

Other Language Names for RondorfiteHide

Dutch:Rondorfiet

German:Rondorfit

Simplified Chinese:罗道尔夫石

Traditional Chinese:羅道爾夫石

Common AssociatesHide

Associations Based on Photo Data:

4 photos of Rondorfite associated with 'Ellestadite'
3 photos of Rondorfite associated with Larnite	Ca₂SiO₄
1 photo of Rondorfite associated with Eltyubyuite	Ca₁₂Fe³⁺₁₀Si₄O₃₂Cl₆
1 photo of Rondorfite associated with 'Hibschite'	Ca₃Al₂(SiO₄)_3-x(OH)_4x
1 photo of Rondorfite associated with Chegemite	Ca₇(SiO₄)₃(OH)₂
1 photo of Rondorfite associated with 'Hydrogarnet'
1 photo of Rondorfite associated with Chlorellestadite	Ca₅(SiO₄)_1.5(SO₄)_1.5Cl
1 photo of Rondorfite associated with Spurrite	Ca₅(SiO₄)₂(CO₃)
1 photo of Rondorfite associated with Hydrocalumite	Ca₄Al₂(OH)₁₂(Cl,CO₃,OH)₂ · 4H₂O

Related Minerals - Strunz-mindat Grouping Hide

9.AB.05	Trimerite	CaMn²⁺₂Be₃(SiO₄)₃	Mon. 2/m : P2₁/m
9.AB.10	Larsenite	PbZnSiO₄	Orth. mm2 : Pna2₁
9.AB.15	Esperite	PbCa₂Zn₃(SiO₄)₃	Mon. 2/m : P2₁/b

Fluorescence of RondorfiteHide

In UV light:

Not fluorescent in Ultraviolet

Other InformationHide

Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for RondorfiteHide

mindat.org URL:

https://www.mindat.org/min-25682.html
Please feel free to link to this page.

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External Links:

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Raman and XRD data at RRUFF project

References and PDF downloads at RRUFF project

American Mineralogist Crystal Structure Database

Handbook of Mineralogy page PDF

Mineral Dealers:

Buy from D. Joyce minerals

References for RondorfiteHide

Reference List:

Rastsvetaeva, R. K., Zadov, A. E., Chukanov, N. V. (2008) Crystal structure of low-symmetry rondorfite. Crystallography Reports, 53 (2) 199-205 doi:10.1134/s1063774508020065

Dulski, M., Bulou, A., Marzec, K.M., Galuskin, E.V., Wrzalik, R. (2013) Structural characterization of rondorfite, calcium silica chlorine mineral containing magnesium in tetrahedral position [MgO4]6-, with the aid of the vibrational spectroscopies and fluorescence. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy: 101: 382-388.

Dulski, M., Bilewska, K., Wojtyniak, M., Szade J., Kusz, J., Nowak, A., Wrzalik, R., Kubacki, J., Galuskin, E.V. (2015) Rondorfite-type structure—XPS and UV–vis study. Materials Research Bulletin: 70: 920-927.

(2021) Rondorfite. Handbook of Mineralogy. Mineralogical Society of America

Localities for RondorfiteHide

Showing 10 localities.

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the

symbol to view information about a locality. The

symbol next to localities in the list can be used to jump to that position on the map.

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Locality ListHide

- This locality has map coordinates listed.

- This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality.

- Good crystals or important locality for species.

- World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). ~~Struck out~~ - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.


Czech Republic
South Moravian Region Brno-Country District Oslavany ⓘ Rosice-Oslavany coalfield	Hršelová et al. (2013)

Georgia
South Ossetia Kel’ volcanic area Shadil-Khokh volcano ⓘ NW slope	Galuskina et al. (2015) +1 other reference

Germany (TL)
Rhineland-Palatinate Mayen-Koblenz Vordereifel Ettringen ⓘ Caspar quarry (TL)	T. Mihajlović +1 other reference
ⓘ Xenolith CS-033	in the collection of Christof Schäfer
ⓘ Xenolith CS-036 (Vondechenite-bearing xenolith)	in the collection of Christof Schäfer

Russia
Chelyabinsk Oblast ⓘ Baturinskaya-Vostochnaya-1-2 mine	Sharygin (2015)
Kabardino-Balkaria Chegemsky District ⓘ Upper Chegem volcanic caldera (Verkhnechegemskaya caldera)	Bailau +1 other reference
Lakargi Mountain ⓘ Xenolith no. 1	Galuskina et al. (2015)
ⓘ Xenolith no. 3	Galuskin et al. (2011)
ⓘ Xenolith no. 7	Galuskin +10 other references

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Rondorfite

About RondorfiteHide

Unique IdentifiersHide

IMA Classification of RondorfiteHide

Classification of RondorfiteHide

Mineral SymbolsHide

Physical Properties of RondorfiteHide

Optical Data of RondorfiteHide

Chemistry of RondorfiteHide

Crystallography of RondorfiteHide

Crystal StructureHide

X-Ray Powder DiffractionHide

Geological EnvironmentHide

Type Occurrence of RondorfiteHide

Synonyms of RondorfiteHide

Other Language Names for RondorfiteHide

Common AssociatesHide

Related Minerals - Strunz-mindat GroupingHide

Fluorescence of RondorfiteHide

Other InformationHide

Internet Links for RondorfiteHide

References for RondorfiteHide

Localities for RondorfiteHide

Locality ListHide

Related Minerals - Strunz-mindat Grouping Hide