Mendozavilite-NaFe
A valid IMA mineral species
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About Mendozavilite-NaFe
Formula:
[Na2(H2O)15Fe3+(H2O)6][Mo8P2Fe3+3O35(OH)2]
Colour:
Empire yellow; orange; brown
Lustre:
Vitreous
Hardness:
1½
Specific Gravity:
3.85
Crystal System:
Monoclinic
Member of:
Name:
First described from the San Judas Mine, Cumobabi, Moctezuma, Sonora, Mexico by Williams (1986). Named in honor of Heriberto Mendoza Avila (1924– ), Phelps Dodge exploration geologist, who found the first specimen. The name was originally simply mendozavilite; the suffix was added by the IMA in 2010.
Formerly called mendozavilite; redefined in 2010 (IMA 10-E).
Unique Identifiers
Mindat ID:
2642
Long-form identifier:
mindat:1:1:2642:6
IMA Classification of Mendozavilite-NaFe
Approved
IMA status notes:
Renamed by the IMA
IMA Formula:
[Na2(H2O)15Fe3+(H2O)6][Mo6+8P2Fe3+3O35(OH)2]
Approval year:
1982
First published:
1986
Approval history:
Renamed from mendozavilite to mendozavilite-NaFe in OMA Proposal 10E (CNMNC Newsletter 7)
Classification of Mendozavilite-NaFe
7.GB.45
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
G : Molybdates, Wolframates and Niobates
B : With additional anions and/or H2O
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
G : Molybdates, Wolframates and Niobates
B : With additional anions and/or H2O
49.4.5.1
49 : HYDRATED MOLYBDATES AND TUNGSTATES
4 : Compound Molybdates and Tungstates
49 : HYDRATED MOLYBDATES AND TUNGSTATES
4 : Compound Molybdates and Tungstates
22.5.6
22 : Phosphates, Arsenates or Vanadates with other Anions
5 : Phosphates, arsenates or vanadates with chromate, molybdate, niobate or tantalate
22 : Phosphates, Arsenates or Vanadates with other Anions
5 : Phosphates, arsenates or vanadates with chromate, molybdate, niobate or tantalate
Mineral Symbols
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 |
|---|---|---|
| Mdz-NaFe | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Pronunciation of Mendozavilite-NaFe
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon Ralph | United Kingdom |
Physical Properties of Mendozavilite-NaFe
Vitreous
Transparency:
Transparent
Colour:
Empire yellow; orange; brown
Streak:
Bright yellow
Hardness:
1½ on Mohs scale
Density:
3.85 g/cm3 (Measured) 2.948 g/cm3 (Calculated)
Optical Data of Mendozavilite-NaFe
Type:
Biaxial (+)
RI values:
nα = 1.762 nβ = 1.763 nγ = 1.766
2V:
Measured: 5° to 15°, Calculated: 62°
Max. Birefringence:
δ = 0.004
Based on recorded range of RI values above.
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.
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.
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
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.
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.
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.
Dispersion:
r > v, extreme
Pleochroism:
Weak
Comments:
In pale yellows.
Comments:
Absorption: Z > Y > X.
Chemistry of Mendozavilite-NaFe
Mindat Formula:
[Na2(H2O)15Fe3+(H2O)6][Mo8P2Fe3+3O35(OH)2]
Element Weights:
Crystallography of Mendozavilite-NaFe
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 18.82(12) Å, b = 11.03(14) Å, c = 15.18(12) Å
β = 129.8(3)°
β = 129.8(3)°
Ratio:
a:b:c = 1.706 : 1 : 1.376
Unit Cell V:
2421 ų
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 9.46 Å | (80) |
| 8.77 Å | (100) |
| 3.676 Å | (50) |
| 3.118 Å | (40) |
| 1.820 Å | (50) |
| 1.552 Å | (40) |
Comments:
San Judas mine, Sonora, Mexico. The data are from the type description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47c : [Carbonates, phosphates, borates, nitrates] |
Type Occurrence of Mendozavilite-NaFe
General Appearance of Type Material:
Crystals are small (~20 µm) but well-formed.
Place of Conservation of Type Material:
Natural History Museum, London, United Kingdom, number BM 1984,475 (cotype).
Geological Setting of Type Material:
Oxide zone of a pegmatite molybdenum deposit.
Associated Minerals at Type Locality:
Synonyms of Mendozavilite-NaFe
Other Language Names for Mendozavilite-NaFe
Relationship of Mendozavilite-NaFe to other Species
Member of:
Other Members of Mendozavilite Group:
| Melkovite | [Ca2(H2O)15Ca(H2O)6][Mo8P2Fe3+3O36(OH)] | Mon. 2/m : B2/m |
| Mendozavilite-KCa | [K2(H2O)15Ca(H2O)6][Mo8P2Fe3+3O34(OH)3] | Mon. 2/m : B2/m |
| Mendozavilite-NaCu | [Na2(H2O)15Cu(H2O)6][Mo8P2Fe3+3O34(OH)3] | Mon. 2/m : B2/m |
Common Associates
Associations Based on Photo Data:
| 13 photos of Mendozavilite-NaFe associated with Molybdenite | MoS2 |
| 8 photos of Mendozavilite-NaFe associated with Paramendozavilite | [KAl4(H2O)30][Mo12P6Fe3+6O60(OH)13] |
| 8 photos of Mendozavilite-NaFe associated with Schorl | NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH) |
| 6 photos of Mendozavilite-NaFe associated with Quartz | SiO2 |
Related Minerals - Strunz-mindat Grouping
| 7.GB. | Stunorthropite | (NH4)4[Mo2O6(MoO4)2] |
| 7.GB. | Hartkoppeite | Ca4Mn2+Mo6+6As5+4O32(OH)2(H2O)14 · 5H2O |
| 7.GB. | Wangpuite | K3(PO4)(Mo12O36) |
| 7.GB. | Alexearlite | Hg3S2(MoO4) |
| 7.GB. | Ootannite | Th4+2W6+4O16 · 5H2O |
| 7.GB. | Natromolybdite | Na2MoO4 · 2H2O |
| 7.GB. | Marsaalamite-(Y) | Y(MoO4)(OH) |
| 7.GB.05 | Lindgrenite | Cu3(MoO4)2(OH)2 |
| 7.GB.10 | Szenicsite | Cu3(MoO4)(OH)4 |
| 7.GB.15 | 'UM1999-38-WO:CrV' | (V, Cr, W, O, H) [V:Cr:W ratio about 2:1:3] |
| 7.GB.15 | Huenite | Cu4(MoO4)3(OH)2 |
| 7.GB.15 | Cuprotungstite | Cu2(WO4)(OH)2 |
| 7.GB.20 | Phyllotungstite | (H2O,M)x(W,Fe)(O,OH)3 · yH2O (M = Ca, Cs, Pb or K) |
| 7.GB.25 | Rankachite | Ca0.5(V4+,V5+)(W6+,Fe3+)2O8(OH) · 2H2O |
| 7.GB.30 | Ferrimolybdite | Fe2(MoO4)3 · nH2O |
| 7.GB.35 | Mpororoite | WAlO3(OH)3 · 2(H2O) |
| 7.GB.35 | Anthoinite | AlWO3(OH)3 |
| 7.GB.40 | Obradovicite-KCu | [K2(H2O)17Cu(H2O)6][Mo8As2Fe3+3O34(OH)3] |
| 7.GB.45 | Paramendozavilite | [KAl4(H2O)30][Mo12P6Fe3+6O60(OH)13] |
| 7.GB.45 | Obradovicite-NaCu | Na2(H2O)17Cu(H2O)6][Mo8As2Fe3+3O34(OH)3] |
| 7.GB.45 | Obradovicite-NaNa | [Na2(H2O)16Na(H2O)6][Mo8As2Fe3+3O33(OH)4] |
| 7.GB.50 | Tancaite-(Ce) | FeCe(MoO4)3 · 3H2O |
| 7.GB.50 | Mendozavilite-NaCu | [Na2(H2O)15Cu(H2O)6][Mo8P2Fe3+3O34(OH)3] |
| 7.GB.50 | Mendozavilite-KCa | [K2(H2O)15Ca(H2O)6][Mo8P2Fe3+3O34(OH)3] |
| 7.GB.60 | Peterandresenite | Mn4Nb6O19 · 14H2O |
| 7.GB.60 | Hansesmarkite | Ca2Mn2Nb6O19 · 20H2O |
| 7.GB.60 | Melcherite | Ba2Na2Mg[Nb6O19] · 6H2O |
| 7.GB.65 | Ichnusaite | Th(MoO4)2 · 3H2O |
| 7.GB.70 | Markascherite | Cu3(MoO4)(OH)4 |
| 7.GB.75 | Nuragheite | Th(MoO4)2 · H2O |
| 7.GB.80 | Ophirite | Ca2Mg4[Zn2Mn3+2(H2O)2(Fe3+W9O34)2] · 46H2O |
Fluorescence of Mendozavilite-NaFe
None
Other Information
Notes:
Readily soluble in dilute acids (HCl, HNO3, H2SO4) at room-temperature.
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 Mendozavilite-NaFe
mindat.org URL:
https://www.mindat.org/min-2642.html
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Please feel free to link to this page.
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References for Mendozavilite-NaFe
Reference List:
Hawthorne, Frank C., Burke, Ernst A. J., Ercit, T. Scott, Grew, Edward S., Grice, Joel D., Jambor, John L., Puziewicz, Jacek, Roberts, Andrew C., Vanko, David A. (1988) New Mineral Names. American Mineralogist, 73 (1-2) 189-199
Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2011) New minerals and nomenclature modifications approved in 2010, CNMNC Newsletter No 7. Mineralogical Magazine, 75 (1) 27-31 doi:10.1180/minmag.2011.075.1.27
Kampf, A. R., Mills, S. J., Rumsey, M. S., Dini, M., Birch, W. D., Spratt, J., Pluth, J. J., Steele, I. M., Jenkins, R. A., Pinch, W. W. (2012) The heteropolymolybdate family: structural relations, nomenclature scheme and new species. Mineralogical Magazine, 76 (5) 1175-1207 doi:10.1180/minmag.2012.076.5.09
Localities for Mendozavilite-NaFe
Showing 5 localities.
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
Australia | |
| W.D. Birch (2002) +1 other reference |
Chile | |
| Kampf et al. (2012) |
Mexico (TL) | |
| Bol. de Mineral. (1986) +2 other references |
USA | |
| Wilson (1989) |
| Mineralogical Society of America - ... |
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San Judas Mine, Cumobabi, El Verde Mining District, Cumpas Municipality, Sonora, Mexico