Goldmanite Mineral Data

Goldmanite Mineral Data +

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General Goldmanite Information

Chemical Formula:

Ca3(V,Al,Fe+++)2(SiO4)3

Composition:

Molecular Weight = 484.97 gm

Calcium 24.79 % Ca 34.69 % CaO

Aluminum 3.34 % Al 6.31 % Al₂O₃

Vanadium 12.60 % V 18.54 % V₂O₃

Iron 2.30 % Fe 3.29 % Fe₂O₃

Silicon 17.37 % Si 37.17 % SiO₂

Oxygen 39.59 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₃V³⁺_1.2Al_0.6Fe³⁺_0.2(SiO₄)₃

Environment:

Vanadium rich clay found in a metamorphosed uranium-vanadium deposit.

IMA Status:

Approved IMA 1964

Locality:

Unnamed prospect pit in the Sandy or South Laguna Mine, Laguna uranium district, Valencia county, New Mexico. Link to MinDat.org Location Data.

Name Origin:

The name honors Macus I. Goldman, a sedimentary petrologist with the U. S. Geological Survey.

Synonym:

ICSD 27369

PDF 16-714

Goldmanite Image

Images:

Goldmanite

Comments: Dark gray granular goldmanite grains in sandstone.
Location: Sandy Mine, Laguna, Cibola County, New Mexico, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Goldmanite Crystallography

Cell Dimensions:

a = 12.011, Z = 8; V = 1,732.76 Den(Calc)= 3.72

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: I a3d

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

By Intensity(I/I_o): 2.688(1), 3.005(0.65), 1.607(0.49),

Forms:

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Forms: [ 2 1 1]

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Crystal Structure:

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Novak G A , Gibbs G V , American Mineralogist , 56 (1971) p.791-823, The crystal chemistry of the silicate garnets, sample Go

Physical Properties of Goldmanite

Cleavage:

None

Color:

Dark green, Brownish green.

Density:

3.74

Diaphaniety:

Transparent to Subopaque

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Hardness:

6-7 - Orthoclase-Quartz

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Goldmanite

Gladstone-Dale:

CI meas= 0.006 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2253,KPDmeas= 0.2241,KC= 0.2253

Optical Data:

Isotropic, n=1.821-1.855.

Calculated Properties of Goldmanite

Electron Density:

r_electron=3.66 gm/cc
note: r_Goldmanite=3.72 gm/cc.

Fermion Index

Fermion Index = 0.00944
Boson Index = 0.99056

Photoelectric:

PE_Goldmanite= 6.87 barns/electron
U=PE_Goldmanite x r_electron= 25.15 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Goldmanite is Not Radioactive

Goldmanite Classification

Dana Class:

51.4.3b.4 (51)Nesosilicate Insular SiO4 Groups Only

(51.4)with cations in [6] and >[6] coordination

(51.4.3b)Garnet group (Ugrandite series)

51.4.3b.1 Andradite Ca3Fe2(SiO4)3 I a3d 4/m 3 2/m

51.4.3b.2 Grossular Ca3Al2(SiO4)3 I a3d 4/m 3 2/m

51.4.3b.3 Uvarovite Ca3Cr2(SiO4)3 I a3d 4/m 3 2/m

51.4.3b.4 Goldmanite Ca3(V,Al,Fe)2(SiO4)3 I a3d 4/m 3 2/m

51.4.3b.5 Yamatoite? (Mn,Ca)3(V,Al)2(SiO4)3 I a3d 4/m 3 2/m

Strunz Class:

VIII/A.08-140 VIII - Silicates

VIII/A - Nesosilicates with [SiO4]4-groups, cations of octahedral and cubic orientation [8+6]

VIII/A.08 - Garnet group, Pyrope - Henritermierite

VIII/A.08-10 Pyrope Mg3Al2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-20 Almandine Fe3Al2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-30 Spessartine Mn3Al2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-40 Calderite (Mn,Ca)3(Fe,Al)2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-50 Knorringite Mg3Cr2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-60 Majorite Mg3(Fe,Al,Si)2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-70 Grossular Ca3Al2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-80 Hibschite Ca3Al2(SiO4)3-x(OH)4x(x=0.2-1.5) I a3d 4/m 3 2/m

VIII/A.08-90 Katoite Ca3Al2(SiO4)3-x(OH)4xx=1.5-3 I a3d 4/m 3 2/m

VIII/A.08-100 Hydrougrandite? (Ca,Mg,Fe)3(Fe,Al)2(SiO4)3-x(OH)4x I a3d 4/m 3 2/m

VIII/A.08-110 Andradite Ca3Fe2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-120 Schorlomite Ca3(Ti,Fe,Al)2[(Si,Fe,Fe)O4]3 I a3d 4/m 3 2/m

VIII/A.08-125 Morimotoite Ca3TiFeSi3O12 I a3d 4/m 3 2/m

VIII/A.08-130 Uvarovite Ca3Cr2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-138 Yamatoite! (Mn,Ca)3(V,Al)2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-140 Goldmanite Ca3(V,Al,Fe)2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-150 Kimzeyite Ca3(Zr,Ti)2(Si,Al,Fe)3O12 I a3d 4/m 3 2/m

VIII/A.08-160 Henritermierite Ca3(Mn,Al)2(SiO4)2(OH)4 I 4₁/acd 4/m 2/m 2/m

Other Goldmanite Information

References:

NAME( MinRec) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Goldmanite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - MinMax(Deutsch)
12 - MinMax(English)
13 - Mineral and Gemstone Kingdom
14 - Mineralienatlas (Deutsch)
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - WWW-MINCRYST

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Goldmanite

Ca3(V,Al,Fe+++)2(SiO4)3
Dana No: 51.4.3b.4 Strunz No: VIII/A.08-140
Locality:

Notes: