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Medaite

A valid IMA mineral species

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Medaite

Molinello Mine, Ne, Genoa, Liguria, Italy

Medaite

Molinello Mine, Ne, Genoa, Liguria, Italy

Medaite

Molinello Mine, Ne, Genoa, Liguria, Italy

Medaite

Molinello Mine, Ne, Genoa, Liguria, Italy

Medaite

Molinello Mine, Ne, Genoa, Liguria, Italy

Medaite

Molinello Mine, Ne, Genoa, Liguria, Italy

Medaite

Molinello Mine, Ne, Genoa, Liguria, Italy

Medaite

Molinello Mine, Ne, Genoa, Liguria, Italy

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About MedaiteHide

Francesco Meda (1926-1977)

Formula:

Mn²⁺₆V⁵⁺Si₅O₁₈(OH)

Mn may be replaced by minor Ca, and V by minor As.

Colour:

Brownish-red

Lustre:

Sub-Adamantine

Specific Gravity:

3.65 - 3.75

Crystal System:

Monoclinic

Name:

Named in 1981 by Carlo M. Gramaccioli, William L. Giffin, and Annibale Mottana in honor of Dr. Francesco Meda (20 September 1926, Turin - 13 September 1977, Turin), an amateur mineralogist whose 'enthusiastic activity as a teacher has contributed to making mineralogy popular in Italy'.

Type Locality:

ⓘ Molinello Mine, Ne, Genoa, Liguria, Italy

Isostructural with:

Arsenmedaite

The V analogue of arsenmedaite.

Unique IdentifiersHide

Mindat ID:

2624

Long-form identifier:

mindat:1:1:2624:2

Similar NamesHide

Mesaite	A valid IMA mineral species	CaMn₅²⁺(V₂O₇)₃ · 12H₂O
Moydite-(Y)	A valid IMA mineral species	Y[B(OH)₄](CO₃)
Uedaite-(Ce)	A valid IMA mineral species	(Mn²⁺Ce)(AlAlFe²⁺)O[Si₂O₇][SiO₄](OH)

IMA Classification of MedaiteHide

IMA status:

Approved

Approval year:

1979

First published:

1982

Type description reference:

Gramaccioli, C.M., Griffin, W.L., Mottana, A. (1982) Medaite, Mn6[VSi5O18(OH)], a new mineral and the first example of vanadatopentasilicate ion. American Mineralogist: 67: 85-89.

Classification of MedaiteHide

Strunz-mindat (2026):

9.BJ.30

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

Dana 8th ed.:

57.4.1.1

57 : SOROSILICATES Si₃O₁₀ Groups and Larger Noncyclic Groups
4 : Insular Si₃O₁₀ and Larger Noncyclic Groups with groups with 6 or more tetrahedra

Hey's CIM Ref.:

17.7.5

17 : Silicates Containing other Anions
7 : Silicates with vanadate, arsenate or antimonate

Mineral SymbolsHide

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

Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.

Symbol	Source	Reference for Standard
Med	IMA–CNMNC	Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43
Med	The Canadian Mineralogist (2019)	The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download

Physical Properties of MedaiteHide

Lustre:

Sub-Adamantine

Transparency:

Translucent

Colour:

Brownish-red

Tenacity:

Brittle

Cleavage:

Distinct/Good
{100} good

Parting:

Distinct normal to elongation

Density:

3.65 - 3.75 g/cm³ (Measured) 3.727 g/cm³ (Calculated)

Optical Data of MedaiteHide

Type:

Biaxial (+)

RI values:

n_α = 1.77(2) n_β = 1.78(1) n_γ = 1.80(2)

2V:

Measured: 71° , Calculated: 72°

Max. Birefringence:

δ = 0.030
Based on recorded range of RI values above.

Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.

Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.

Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.

Thickness: 30 µm Order divisions

Rotation:

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

Interference Figure:

This shows the idealized biaxial acute bisectrix (Bxa) interference figure - the conoscopic view for a grain cut perpendicular to the acute bisectrix, using this mineral's 2V. The two small white dots mark the melatopes - the points where the two optic axes emerge - and are shown only when they fall within the field of view. The coloured bands are isochromatics, and the dark bands are isogyres.

Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.

Thickness: 30 µm

Stage rotation: 0°

Dispersion:

r > v distinct

Pleochroism:

Weak

Comments:

Dark to lighter orange

Comments:

X = a; Y = b; Z = c; X Λ ⊥ to cleavage = 3°.

Chemistry of MedaiteHide

Mindat Formula:

Mn²⁺₆V⁵⁺Si₅O₁₈(OH)

Mn may be replaced by minor Ca, and V by minor As.

Element Weights:

Element	% weight
Mn	39.907 %
O	36.803 %
Si	17.001 %
V	6.167 %
H	0.122 %

Calculated from ideal end-member formula.

Elements listed:

H, Mn, O, Si, V - search for minerals with similar chemistry

Common Impurities:

Fe,H₂O

Crystallography of MedaiteHide

Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Cell Parameters:

a = 6.712(1) Å, b = 28.948(8) Å, c = 7.578(2) Å
β = 95.4(2)°

Ratio:

a:b:c = 0.232 : 1 : 0.262

Unit Cell V:

1,465.86 Å³ (Calculated from Unit Cell)

Twinning:

Microscopic symmetrical twinning. The twin plane is coincident with {100}.

Comment:

Space Group: P21/n:

Crystal StructureHide

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2x2x2 | 3x3x3 | 4x4x4

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

ID	Species	Reference	Year	Locality	Temp (K)
0019904	Medaite	Nagashima M, Armbruster T (2010) Ardennite, tiragalloite and medaite: structural control of (As5+,V5+,Si4+)O4 tetrahedra in silicates Mineralogical Magazine 74 55-71	2010	Fianel, Val Ferrera, Graubunden, Switzerland	293
0019903	Medaite	Nagashima M, Armbruster T (2010) Ardennite, tiragalloite and medaite: structural control of (As5+,V5+,Si4+)O4 tetrahedra in silicates Mineralogical Magazine 74 55-71	2010	Molinello, Val Graveglia, Liguria, Italy	293
0009748	Medaite	Gramaccioli C M, Liborio G, Pilati T (1981) Structure of medaite, Mn6[VSi5O18(OH)]: The presence of a new kind of heteropolysilicate anion Acta Crystallographica B37 1972-1978	1981	Molinello, Chavari, Liguria, Italy	293

CIF Raw Data - click here to close

data_global
_chemical_name_mineral 'Medaite'
loop_
_publ_author_name
'Nagashima M'
'Armbruster T'
_journal_name_full 'Mineralogical Magazine'
_journal_volume 74 
_journal_year 2010
_journal_page_first 55
_journal_page_last 71
_publ_section_title
;
 Ardennite, tiragalloite and medaite: structural control of (As5+,V5+,Si4+)O4
 tetrahedra in silicates
;
_database_code_amcsd 0019904
_chemical_compound_source 'Fianel, Val Ferrera, Graubunden, Switzerland'
_chemical_formula_sum 'Mn6 Si5.07 V.837 As.093 O19 H'
_cell_length_a 6.6748
_cell_length_b 28.8203
_cell_length_c 7.5444
_cell_angle_alpha 90
_cell_angle_beta 95.363
_cell_angle_gamma 90
_cell_volume 1444.961
_exptl_crystal_density_diffrn      3.800
_symmetry_space_group_name_H-M 'P 1 21/n 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2-y,1/2+z'
  '1/2-x,1/2+y,1/2-z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_U_iso_or_equiv
Mn1   0.37041   0.02258   0.15426   1.00000   0.01430
Mn2   0.68345   0.31660   0.02673   1.00000   0.00940
Mn3   0.45452   0.13659   0.22263   1.00000   0.00930
Mn4   0.67002   0.08672   0.91860   1.00000   0.00860
Mn5   0.14027   0.07644   0.44126   1.00000   0.01150
Mn6   0.47452   0.25295   0.31019   1.00000   0.01130
SiT1   0.69520   0.16629   0.59150   1.00000   0.00690
SiT2   0.64130   0.06170   0.51630   1.00000   0.00570
SiT3   0.86590   0.01174   0.22840   1.00000   0.00530
SiT4   0.81590  -0.09457   0.16470   1.00000   0.00540
SiT5   1.03840  -0.14638  -0.11570   1.00000   0.00540
VT6   0.49247   0.21348   0.88249   0.83700   0.00570
AsT6   0.49247   0.21348   0.88249   0.09300   0.00570
SiT6   0.49247   0.21348   0.88249   0.07000   0.00570
O1   0.65380   0.25747   0.85800   1.00000   0.01200
O2   0.45120   0.20246   1.09050   1.00000   0.01060
O3   0.27600   0.22427   0.76050   1.00000   0.01450
O4   0.60830   0.16481   0.79260   1.00000   0.01010
O5   0.51030   0.18438   0.45360   1.00000   0.00930
O6   0.89260   0.19739   0.60020   1.00000   0.01070
O7   0.75250   0.11238   0.55300   1.00000   0.00990
O8   0.44660   0.06924   0.37410   1.00000   0.00860
O9   0.59640   0.04149   0.70410   1.00000   0.00970
O10   0.80610   0.02939   0.42580   1.00000   0.01120
O11   1.07390   0.03680   0.20890   1.00000   0.01130
O12   0.68670   0.02236   0.07500   1.00000   0.00870
O13   0.89770  -0.04412   0.24480   1.00000   0.01150
O14   0.63070  -0.09014   0.01270   1.00000   0.00860
O15   0.77710  -0.12128   0.34470   1.00000   0.00950
O16   1.00250  -0.11735   0.06820   1.00000   0.00920
O17   1.25340  -0.12767  -0.15570   1.00000   0.00900
O18   0.86400  -0.13968  -0.27990   1.00000   0.00910
O19   1.03090  -0.20130  -0.05310   1.00000   0.01210
H19   0.97200  -0.21700  -0.16000   1.00000   0.05000
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
Mn1 0.01430 0.01420 0.01440 0.00000 0.00160 -0.00140
Mn2 0.00970 0.00850 0.01030 -0.00140 0.00270 -0.00120
Mn3 0.00830 0.00960 0.01030 0.00030 0.00180 -0.00050
Mn4 0.00780 0.00940 0.00860 -0.00180 0.00100 -0.00180
Mn5 0.01200 0.01310 0.00920 -0.00120 0.00050 -0.00350
Mn6 0.01270 0.01010 0.01160 -0.00080 0.00260 0.00150
SiT1 0.00650 0.00770 0.00630 -0.00150 -0.00080 0.00000
SiT2 0.00560 0.00550 0.00570 0.00000 -0.00010 -0.00020
SiT3 0.00500 0.00640 0.00440 0.00090 -0.00050 -0.00060
SiT4 0.00620 0.00490 0.00500 0.00030 0.00030 -0.00020
SiT5 0.00430 0.00700 0.00470 0.00080 -0.00060 -0.00030
VT6 0.00590 0.00670 0.00450 -0.00020 0.00010 0.00080
AsT6 0.00590 0.00670 0.00450 -0.00020 0.00010 0.00080
SiT6 0.00590 0.00670 0.00450 -0.00020 0.00010 0.00080
O1 0.01100 0.00500 0.02000 -0.00020 0.00290 0.00200
O2 0.01800 0.00800 0.00600 0.00140 0.00100 0.00110
O3 0.01200 0.01700 0.01300 0.00460 -0.00370 0.00050
O4 0.01000 0.01500 0.00600 -0.00120 0.00240 0.00480
O5 0.00900 0.00700 0.01100 0.00220 -0.00330 -0.00300
O6 0.00900 0.01100 0.01100 -0.00510 0.00060 -0.00050
O7 0.01100 0.00600 0.01200 -0.00170 -0.00420 -0.00360
O8 0.00700 0.00800 0.01100 -0.00070 -0.00060 -0.00120
O9 0.00900 0.01000 0.01000 0.00030 0.00020 0.00110
O10 0.01100 0.01600 0.00600 0.00750 -0.00260 -0.00140
O11 0.00800 0.01300 0.01200 -0.00290 -0.00160 0.00030
O12 0.01000 0.01100 0.00500 0.00100 0.00000 0.00050
O13 0.01000 0.00500 0.01800 0.00360 -0.00580 -0.00400
O14 0.00800 0.00600 0.01100 0.00050 -0.00110 -0.00260
O15 0.01000 0.01000 0.00900 0.00090 0.00250 0.00260
O16 0.01100 0.00900 0.00700 0.00190 -0.00160 -0.00370
O17 0.00700 0.01100 0.00900 0.00040 0.00080 -0.00060
O18 0.00600 0.00900 0.01200 -0.00050 -0.00280 0.00030
O19 0.02000 0.01000 0.00600 -0.00430 -0.00450 0.00040

X-Ray Powder DiffractionHide

Powder Diffraction Data:

d-spacing	Intensity
3.259 Å	(100)
3.159 Å	(83)
3.097 Å	(70)
2.613 Å	(69)
2.941 Å	(68)
3.009 Å	(47)
2.785 Å	(47)

Geological EnvironmentHide

Paragenetic Mode(s):

Paragenetic Mode	Earliest Age (Ga)
Near-surface Processes
22 : Hydration and low-? subsurface aqueous alteration (see also #23)
Stage 7: Great Oxidation Event	<2.4
47a : [Near-surface hydration of prior minerals]
47d : [Arsenates, antimonates, selenates, bismuthinates]
47e : [Vanadates, chromates, manganates]

Type Occurrence of MedaiteHide

Type Locality:

ⓘ Molinello Mine, Ne, Genoa, Liguria, Italy

General Appearance of Type Material:

Small brown grains embedded in brownish veinlets, a few millimeters thick, cutting a black Mn ore made up
mainly of quartz and braunite. The grains reach 1.5 mm but are usually smaller. They are usually embedded in quartz.

Place of Conservation of Type Material:

Institute of Mineralogy, Milan, Mineral Museums of Universities of Rome and Oslo, Norway.

Geological Setting of Type Material:

Manganese mine.

Associated Minerals at Type Locality:

Reference:

Gramaccioli, C.M., Griffin, W.L., Mottana, A. (1982) Medaite, Mn6[VSi5O18(OH)], a new mineral and the first example of vanadatopentasilicate ion. American Mineralogist: 67: 85-89.

Synonyms of MedaiteHide

IMA1979-062

Other Language Names for MedaiteHide

Dutch:Medaiet

German:Medait

Russian:Медаит

Spanish:Medaita

Common AssociatesHide

Associations Based on Photo Data:

3 photos of Medaite associated with Arsenmedaite	Mn²⁺₆ As⁵⁺Si₅O₁₈(OH)
2 photos of Medaite associated with Pyroxmangite	Mn²⁺SiO₃
1 photo of Medaite associated with Rhodochrosite	MnCO₃
1 photo of Medaite associated with Tiragalloite	Mn²⁺₄As⁵⁺Si₃O₁₂(OH)
1 photo of Medaite associated with Quartz	SiO₂
1 photo of Medaite associated with Ganophyllite	(K,Na)_xMn²⁺₆(Si,Al)₁₀O₂₄(OH)₄ · nH₂O (x = 1-2; n = 7-11)

Related Minerals - Strunz-mindat Grouping Hide

9.BJ.	Arsenmedaite	Mn²⁺₆ As⁵⁺Si₅O₁₈(OH)	Mon. 2/m
9.BJ.05	Orientite	Ca₈Mn³⁺₁₀(SiO₄)₃(Si₃O₁₀)₃(OH)₁₀ · 4H₂O	Orth. mmm(2/m2/m2/m)
9.BJ.10	Rosenhahnite	HCa₃[Si₃O₉(OH)]	Tric. 1 : P1
9.BJ.15	Trabzonite	Ca₄(Si₃O₉)(OH)₂	Orth. mm2 : Ama2
9.BJ.20	Thalénite-(Y)	Y₃Si₃O₁₀F	Mon. 2/m : P2₁/b
9.BJ.25	Tiragalloite	Mn²⁺₄As⁵⁺Si₃O₁₂(OH)	Mon. 2/m
9.BJ.35	Strontioruizite	Sr₂Mn³⁺₂Si₄O₁₁(OH)₄ · 2H₂O	Mon. 2 : B2
9.BJ.35	Ruizite	Ca₂Mn³⁺₂[Si₄O₁₁(OH)₂](OH)₂ · 2H₂O	Mon. 2
9.BJ.35	Taniajacoite	SrCaMn³⁺₂Si₄O₁₁(OH)₄ · 2H₂O	Tric. 1
9.BJ.40	Ardennite-(As)	Mn²⁺₄Al₄(AlMg)(AsO₄)(SiO₄)₂(Si₃O₁₀)(OH)₆	Orth. mmm(2/m2/m2/m)
9.BJ.40	Kannanite	Ca₄Al₄(AlMg)(VO₄)(SiO₄)₂(Si₃O₁₀)(OH)₆	Orth. mmm(2/m2/m2/m) : Pmmn
9.BJ.40	Alpeite	Ca₄Mn³⁺₂Al₂(Mn³⁺Mg)(SiO₄)₂(Si₃O₁₀)(V⁵⁺O₄)(OH)₆	Orth. mmm(2/m2/m2/m) : Pmmn
9.BJ.40	Ardennite-(V)	Mn²⁺₄Al₄(AlMg)(VO₄)(SiO₄)₂(Si₃O₁₀)(OH)₆	Orth. mmm(2/m2/m2/m) : Pmmn
9.BJ.45	Kilchoanite	Ca₆(SiO₄)(Si₃O₁₀)	Orth. mmm(2/m2/m2/m)
9.BJ.50	Prismatine	(◻,Fe,Mg)(Mg,Al,Fe)₅Al₄Si₂(Si,Al)₂(B,Si,Al)(O,OH,F)₂₂	Orth. mmm(2/m2/m2/m) : Cmcm
9.BJ.50	Kornerupine	Mg₃Al₆(Si,Al,B)₅O₂₁(OH)	Orth. mmm(2/m2/m2/m) : Cmcm
9.BJ.55	Zunyite	Al₁₃Si₅O₂₀(OH,F)₁₈Cl	Iso. 43m : F43m
9.BJ.60	Hubeite	Ca₂Mn²⁺Fe³⁺Si₄O₁₂(OH) · 2H₂O	Tric. 1 : P1
9.BJ.65	Cassagnaite	(Ca,Mn²⁺)₄(Fe³⁺,Mn³⁺,Al)₄(V³⁺,Mg,Al)₂(Si₃O₁₀)(SiO₄)₂(OH,O)₈	Orth. mmm(2/m2/m2/m) : Cmcm
9.BJ.70	Pavlovskyite	Ca₈(SiO₄)₂(Si₃O₁₀)	Orth. mmm(2/m2/m2/m) : Pbcn

Other InformationHide

Notes:

Insoluble in water, HCl, and HNO3.

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 MedaiteHide

mindat.org URL:

https://www.mindat.org/min-2624.html
Please feel free to link to this page.

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External Links:

Look for Medaite on Webmineral

Look for Medaite on Wikipedia

Look for Medaite on Mineralien Atlas

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 MedaiteHide

Reference List:

Gramaccioli, C. M.; Liborio, G.; Pilati, T. (1981) Structure of medaite, Mn6[VSi5O18(OH)]: the presence of a new kind of heteropolysilicate anion. Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry, 37 (11). 1972-1978 doi:10.1107/s0567740881007796

Gramaccioli, C.M., Griffin, W.L., Mottana, A. (1982) Medaite, Mn6[VSi5O18(OH)], a new mineral and the first example of vanadatopentasilicate ion. American Mineralogist: 67: 85-89.

(2001) Medaite. Handbook of Mineralogy. Mineralogical Society of America

Nagashima, M., Armbruster, T. (2010) Ardennite, tiragalloite and medaite: structural control of (As⁵⁺,V⁵⁺,Si⁴⁺)O₄ tetrahedra in silicates. Mineralogical Magazine, 74 (1) 55-71 doi:10.1180/minmag.2010.074.1.55

Localities for MedaiteHide

Showing 9 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.

Hide all sections | Show all sections

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.


Italy
Liguria Genoa Ne ⓘ Cassagna Mine	Redazionale (2005)
ⓘ Molinello Mine (TL)	415. +2 other references
Reppia ⓘ Gambatesa Mine	Pipino (1984)
Statale ⓘ Scrava Mine (Statale Mine)	Castellaro et al. (2023)
La Spezia Province Maissana Monte Alpe ⓘ Monte Alpe Mine	Castellaro et al. (2011)

Japan
Kagoshima Prefecture Oshima District Yamato village ⓘ Yamato mine	Go Ito pers. comm.

Spain
Canary Islands Santa Cruz de Tenerife Province Tenerife Candelaria Barranco Hondo ⓘ ~~Lava flow~~	Dill et al. (2023)
ⓘ ~~Los Humilladeros~~	Dill et al. (2023)

Switzerland
Grisons Viamala Region Ferrera Ausserferrera ⓘ Fianel	Brugger et al. (2003) +1 other reference

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Medaite

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