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Arsenmedaite

A valid IMA mineral species
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08387950017272472976081.jpg
Arsenmedaite, etc.

Fuchs Alp - Fuchs lake area, Tweng, Tamsweg District, Salzburg, Austria
04601610017272001275166.jpg
Arsenmedaite

Molinello Mine, Ne, Genoa, Liguria, Italy
05293260017271981565962.jpg
Arsenmedaite, etc.

Fuchs Alp - Fuchs lake area, Tweng, Tamsweg District, Salzburg, Austria
06139160017866377651968.jpg
Arsenmedaite, etc.

Fuchs Alp - Fuchs lake area, Tweng, Tamsweg District, Salzburg, Austria
02426600017272472983804.jpg
Arsenmedaite

Molinello Mine, Ne, Genoa, Liguria, Italy
07719840017272472986186.jpg
Arsenmedaite, etc.

Fuchs Alp - Fuchs lake area, Tweng, Tamsweg District, Salzburg, Austria
09971150017272082932639.jpg
Arsenmedaite, etc.

Fuchs Alp - Fuchs lake area, Tweng, Tamsweg District, Salzburg, Austria
04601610017272001275166.jpg
Arsenmedaite

Molinello Mine, Ne, Genoa, Liguria, Italy
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About ArsenmedaiteHide

07722160017271925061608.jpg
Francesco Meda (1926-1977)
Formula:
Mn2+6 As5+Si5O18(OH)
Colour:
Orange-reddish
Lustre:
Vitreous
Specific Gravity:
3.772 (Calculated)
Crystal System:
Monoclinic
Name:
Named owing to this chemical relationship with medaite, which was named after Francesco Meda (20 September 1926, Turin, Italy - 13 September 1977, Turin, Italy).
The As analogue of medaite.


Unique IdentifiersHide

Mindat ID:
51567
Long-form identifier:
mindat:1:1:51567:8

IMA Classification of ArsenmedaiteHide

Classification of ArsenmedaiteHide

Strunz-mindat (2026):
9.BJ.

9 : SILICATES (Germanates)
B : Sorosilicates
J : Sorosilicates with Si3O10, Si4O11, etc. anions; cations in octahedral [6] 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.

SymbolSourceReference for Standard
AmedIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of ArsenmedaiteHide

Lustre:
Vitreous
Colour:
Orange-reddish
Streak:
White
Tenacity:
Brittle
Cleavage:
Distinct/Good
Good {100}.
Parting:
A parting normal to the elongation.
Fracture:
Irregular/Uneven
Density:
3.772 g/cm3 (Calculated)

Chemistry of ArsenmedaiteHide

Mindat Formula:
Mn2+6 As5+Si5O18(OH)
Element Weights:
Element% weight
Mn38.781 %
O35.765 %
Si16.521 %
As8.815 %
H0.119 %

Calculated from ideal end-member formula.
Elements listed:
As, H, Mn, O, Si - search for minerals with similar chemistry

Crystallography of ArsenmedaiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 6.7099(3) Å, b = 29.001(1) Å, c = 7.5668(3) Å
β = 95.469(3)°, γ = °
Ratio:
a:b:c = 0.231 : 1 : 0.261
Unit Cell V:
1,465.75 ų (Calculated from Unit Cell)
Z:
4
Comment:
Space group P21/n.

X-Ray Powder DiffractionHide

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
High-? alteration and/or metamorphism
32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits

Type Occurrence of ArsenmedaiteHide

Type Locality:
ⓘ Molinello Mine, Ne, Genoa, Liguria, Italy
General Appearance of Type Material:
Prismatic crystals, up to 200 μm.
Place of Conservation of Type Material:
Type material is deposited in the mineralogical collections of the Museo di Storia Naturale, Università di Pisa, Via Roma 79, Calci (Pisa), Italy, catalogue number 19901, and the Dipartimento di Scienze della Terra, dell’Ambiente e della Vita (DISTAV), Università di Genova, Corso Europa 26, Genova, Italien, catalogue number MO483.
Geological Setting of Type Material:
In veinlets, a few mm in thickness, cutting the braunite ore bodies hosted by Jurassic metacherts.
Associated Minerals at Type Locality:
BrauniteCalciteGanophylliteMedaiteQuartz
Talc
Reference:
Biagioni, Cristian, Belmonte, Donato, Carbone, Cristina, Cabella, Roberto, Zaccarini, Federica, Balestra, Corrado (2019) Arsenmedaite, Mn62+As5+Si5O18OH, the arsenic analogue of medaite, from the Molinello mine, Liguria, Italy: occurrence and crystal structure. European Journal of Mineralogy, 31 (1) 117-126 doi:10.1127/ejm/2018/0030-2792

Synonyms of ArsenmedaiteHide

Other Language Names for ArsenmedaiteHide

Common AssociatesHide

Associations Based on Photo Data:
3 photos of Arsenmedaite associated with MedaiteMn2+6V5+Si5O18(OH)
2 photos of Arsenmedaite associated with TiragalloiteMn2+4As5+Si3O12(OH)
2 photos of Arsenmedaite associated with AlbiteNa(AlSi3O8)
2 photos of Arsenmedaite associated with K Feldspar
2 photos of Arsenmedaite associated with HematiteFe2O3
2 photos of Arsenmedaite associated with RhodoniteCaMn3Mn[Si5O15]
2 photos of Arsenmedaite associated with RhodochrositeMnCO3
1 photo of Arsenmedaite associated with BaryteBaSO4
1 photo of Arsenmedaite associated with SpessartineMn2+3Al2(SiO4)3

Related Minerals - Strunz-mindat GroupingHide

9.BJ.05OrientiteCa8Mn3+10(SiO4)3(Si3O10)3(OH)10 · 4H2O Orth. mmm(2/m2/m2/m)
9.BJ.10RosenhahniteHCa3[Si3O9(OH)]Tric. 1 : P1
9.BJ.15TrabzoniteCa4(Si3O9)(OH)2Orth. mm2 : Ama2
9.BJ.20Thalénite-(Y)Y3Si3O10FMon. 2/m : P21/b
9.BJ.25TiragalloiteMn2+4As5+Si3O12(OH)Mon. 2/m
9.BJ.30MedaiteMn2+6V5+Si5O18(OH)Mon. 2/m
9.BJ.35StrontioruiziteSr2Mn3+2Si4O11(OH)4 · 2H2OMon. 2 : B2
9.BJ.35RuiziteCa2Mn3+2[Si4O11(OH)2](OH)2 · 2H2OMon. 2
9.BJ.35Taniajacoite SrCaMn3+2Si4O11(OH)4 · 2H2OTric. 1
9.BJ.40Ardennite-(As)Mn2+4Al4(AlMg)(AsO4)(SiO4)2(Si3O10)(OH)6Orth. mmm(2/m2/m2/m)
9.BJ.40KannaniteCa4Al4(AlMg)(VO4)(SiO4)2(Si3O10)(OH)6Orth. mmm(2/m2/m2/m) : Pmmn
9.BJ.40AlpeiteCa4Mn3+2Al2(Mn3+Mg)(SiO4)2(Si3O10)(V5+O4)(OH)6Orth. mmm(2/m2/m2/m) : Pmmn
9.BJ.40Ardennite-(V)Mn2+4Al4(AlMg)(VO4)(SiO4)2(Si3O10)(OH)6Orth. mmm(2/m2/m2/m) : Pmmn
9.BJ.45KilchoaniteCa6(SiO4)(Si3O10)Orth. mmm(2/m2/m2/m)
9.BJ.50Prismatine(◻,Fe,Mg)(Mg,Al,Fe)5Al4Si2(Si,Al)2(B,Si,Al)(O,OH,F)22Orth. mmm(2/m2/m2/m) : Cmcm
9.BJ.50KornerupineMg3Al6(Si,Al,B)5O21(OH)Orth. mmm(2/m2/m2/m) : Cmcm
9.BJ.55ZunyiteAl13Si5O20(OH,F)18ClIso. 43m : F43m
9.BJ.60HubeiteCa2Mn2+Fe3+Si4O12(OH) · 2H2OTric. 1 : P1
9.BJ.65Cassagnaite(Ca,Mn2+)4(Fe3+,Mn3+,Al)4(V3+,Mg,Al)2(Si3O10)(SiO4)2(OH,O)8Orth. mmm(2/m2/m2/m) : Cmcm
9.BJ.70PavlovskyiteCa8(SiO4)2(Si3O10)Orth. mmm(2/m2/m2/m) : Pbcn

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 ArsenmedaiteHide

References for ArsenmedaiteHide

Localities for ArsenmedaiteHide

Showing 3 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.
Austria
 
  • Salzburg
    • Tamsweg District
      • Tweng
Kolitsch et al. (2021)
Italy (TL)
 
  • Liguria
    • Genoa
      • Ne
Mineralogical Magazine +2 other references
        • Statale
Castellaro et al. (2023)
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