Mendozavilite Mineral Data

Mendozavilite Mineral Data +

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General Mendozavilite Information

Chemical Formula:

(Na,Mg)Ca2[Mo++++++8P+++++2Fe+++3O36(OH)]·n(H2O), n~9

Composition:

Molecular Weight = 1,847.68 gm

Sodium 0.75 % Na 1.01 % Na₂O

Strontium 0.47 % Sr 0.56 % SrO

Calcium 3.69 % Ca 5.16 % CaO

Magnesium 0.26 % Mg 0.44 % MgO

Iron 9.07 % Fe 12.96 % Fe₂O₃

Molybdenum 41.54 % Mo 62.32 % MoO₃

Phosphorus 3.35 % P 7.68 % P₂O₅

Hydrogen 1.04 % H 9.26 % H₂O

Oxygen 39.83 % O

______ ______

100.00 % 99.39 % = TOTAL OXIDE

Empirical Formula:

Na_0.6Mg_0.2Ca_1.7Sr_0.1Mo₈P₂Fe³⁺₃O₃₆(OH)·9(H₂O)

Environment:

Mo-rich pegmatite.

IMA Status:

Approved IMA 1986

Locality:

Cumobabi molybdenum deposit, SW of Cumpas, Sonora, Mexico. Link to MinDat.org Location Data.

Name Origin:

Named for H. Mendoza Avila, Mexican geologist, who found the mineral.

Mendozavilite Image

Images:

Mendozavilite

Comments: Vuggy matrix covered with yellow micro crystals of mendozavilite.
Location: Rustler mine, Tooele County, Utah, USA. Scale: Specimen size 1 cm.
© John Veevaert

Images:

Mendozavilite

Comments: Light yellow micro crystals of mendozavilite and earthy alterations in vuggy quartz matrix with black schorl.
Location: Rustler mine, Tooele Co., Utah, USA. Scale: Picture size 1 cm.
© Tom Loomis / Dakota Matrix

Mendozavilite Crystallography

Axial Ratios:

a:b:c =1.7216:1:1.372

Cell Dimensions:

a = 18.952, b = 11.008, c = 15.103, Z = 3; beta = 129.89° V = 2,417.57 Den(Calc)= 3.81

Crystal System:

MonoclinicSpace Group: Unk.

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 8.81(1)(111,110), 11.51(0.56)(001), 9.56(0.31)(201),3.65(0.19)(221,400), 2.993(0.17)(222), 3.12(0.16)(113), 4.37(0.16)(220),

Physical Properties of Mendozavilite

Color:

Yellow, Orange.

Density:

3.85

Diaphaniety:

Transparent to Translucent

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Hardness:

1.5 - Between Talc and Gypsum

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

light yellow

Optical Properties of Mendozavilite

Gladstone-Dale:

CI meas= 0.202 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.193 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2004,KPDmeas= 0.1984,KC= 0.2485

Optical Data:

Biaxial (+), a=1.762, b=1.763, g=1.766, bire=0.0040, 2V(Calc)=62, 2V(Meas)=5-15. Dispersion very strong, r > v.

Pleochroism (x):

colorless.

Pleochroism (y):

pale yellow.

Pleochroism (z):

pale yellow.

Calculated Properties of Mendozavilite

Electron Density:

r_electron=3.62 gm/cc
note: r_{Mendozavilite}=3.81 gm/cc.

Fermion Index

Fermion Index = 0.10856
Boson Index = 0.89144

Photoelectric:

PE_{Mendozavilite}= 70.87 barns/electron
U=PE_{Mendozavilite} x r_electron= 256.56 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Mendozavilite is Not Radioactive

Mendozavilite Classification

Dana Class:

49.4.5.1 (49)Basic and Hydrated Molybdates and Tungstates

(49.4)(Compound Anions)

(49.4.5)Dana Group

49.4.5.1 Mendozavilite (Na,Mg)Ca2[Mo8P2Fe3O36(OH)]·n(H2O),n~9 Unk. Mono

Strunz Class:

VII/D.57-10 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of very big and medium size: Al, Mg and Ca, Na, K

VII/D.57 - Mendozavilite - Paramendozavilite series

VII/D.57-10 Mendozavilite (Na,Mg)Ca2[Mo8P2Fe3O36(OH)]·n(H2O),n~9 Unk. Mono

VII/D.57-20 Paramendozavilite NaAl4Fe7(PO4)5(PMo12O40)(OH)16·56(H2O) Unk. Mono

Other Mendozavilite Information

References:

NAME( Dana8) PHYS. PROP.(AmMin, Vol 88, p 478) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Mendozavilite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris

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Print or Cut-and-Paste your Mendozavilite Specimen Label here :

Mendozavilite

(Na,Mg)Ca2[Mo++++++8P+++++2Fe+++3O36(OH)]·n(H2O), n~9
Dana No: 49.4.5.1 Strunz No: VII/D.57-10
Locality:

Notes: