Schoderite Mineral Data

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General Schoderite Information

Chemical Formula:

Al2(PO4)(VO4)•8(H2O)

Composition:

Molecular Weight = 408.00 gm

Aluminum 13.23 % Al 24.99 % Al₂O₃

Vanadium 12.49 % V 22.29 % V₂O₅

Phosphorus 7.59 % P 17.40 % P₂O₅

Hydrogen 3.95 % H 35.32 % H₂O

Oxygen 62.74 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Al₂(PO₄)(VO₄)•8(H₂O)

IMA Status:

Approved IMA 1962

Locality:

Fish Creek Range, near Eureka, Nevada, USA. Link to MinDat.org Location Data.

Name Origin:

Named for William P. Schoder (1900-1977), U. S. Chemist.

Name Pronunciation:

Schoderite + Pronunciation

Schoderite Image

Images:

Schoderite

Comments: Sub-mm coatings of yellow to deep orange Schoderite on matrix.
Location: Fish Creek Range, Eureka County, Nevada, USA. Scale: Picture size 2 cm.
© John Veevaert

Schoderite Crystallography

Axial Ratios:

a:b:c =0.5313:1:0.4101

Cell Dimensions:

a = 16.26, b = 30.6, c = 12.55, Z = 18; beta = 91.77° V = 6,241.35 Den(Calc)= 1.95

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/m

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

By Intensity(I/I_o): 16.33(1), 15.34(0.7), 7.64(0.35),

Physical Properties of Schoderite

Cleavage:

{010} Good

Color:

Yellow, Orange.

Density:

1.88

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

2 - Gypsum

Streak:

yellow

Optical Properties of Schoderite

Gladstone-Dale:

CI meas= -0.071 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.033 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2885,KPDmeas= 0.2993,KC= 0.2795
Ncalc = 1.53 - 1.54

Optical Data:

Biaxial (-), a=1.56, b=1.563, g=1.565, bire=0.0050, 2V(Calc)=78, 2V(Meas)=43.

Calculated Properties of Schoderite

Electron Density:

Bulk Density (Electron Density)=1.99 gm/cc
note: Specific Gravity of Schoderite =1.95 gm/cc.

Fermion Index:

Fermion Index = 0.0006192422
Boson Index = 0.9993807578

Photoelectric:

PE_Schoderite= 3.11 barns/electron
U=PE_Schoderite x rElectron Density= 6.18 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Schoderite is Not Radioactive

Schoderite Classification

Dana Class:

43.03.01.01 (43)Compound Phosphates, etc.

(43.03)(Hydrated Normal Compound Anions)

(43.03.01)Embreyite Group

43.03.01.01 Schoderite Al2(PO4)(VO4)•8(H2O) P 2₁/m 2/m

43.03.01.02 Metaschoderite Al2(PO4)(VO4)•6(H2O) P 2/m 2/m

Strunz Class:

08.CE.70 08 - PHOSPHATES, ARSENATES, VANADATES

08.C - Phosphates without Additional Anions, with H2O

08.CE -With only medium-sized cations, RO4:H2O £ 1:2.5

08.CE.70 Metaschoderite Al2(PO4)(VO4)•6(H2O) P 2/m 2/m

08.CE.70 Schoderite Al2(PO4)(VO4)•8(H2O) P 2₁/m 2/m

Other Schoderite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Schoderite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info

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Ask about Schoderite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Schoderite

Al2(PO4)(VO4)•8(H2O)
Dana No: 43.03.01.01 Strunz No: 08.CE.70
Locality:

Notes: