Steigerite Mineral Data

General Steigerite Information

Chemical Formula:

AlVO4•3(H2O)

Composition:

Molecular Weight = 195.97 gm

Aluminum 13.77 % Al 26.01 % Al₂O₃

Vanadium 26.00 % V 46.41 % V₂O₅

Hydrogen 3.09 % H 27.58 % H₂O

Oxygen 57.15 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Al(VO₄)•3(H₂O)

Environment:

In sandstone.

IMA Status:

Valid Species (Pre-IMA) 1935

Locality:

Sullivan Brothers claim, Cypsum Valley, San Miguel County, Colorado, USA. Link to MinDat.org Location Data.

Name Origin:

Named for George Steiger (1869-1944), Chief chemist, U. S. Gological Survey.

Name Pronunciation:

Steigerite + Pronunciation

Steigerite Image

Images:

Steigerite

Comments: Earthy yellow steigerite masses on sandstone.
Location: Yellow Cat District, Grand County, Utah, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Steigerite Crystallography

Axial Ratios:

a:b:c =0.4736:1:0.4416

Cell Dimensions:

a = 11.84, b = 25, c = 11.04, Z = 24; beta = 110.16° V = 3,067.63 Den(Calc)= 2.55

Crystal System:

Monoclinic Space Group: P 2₁/m, P 2

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

By Intensity(I/I_o): 2.93(1), 2.18(0.5), 12.52(0.5),1.426(0.4), 2.21(0.4), 3.09(0.4), 2.96(0.3), 5.67(0.3),

Physical Properties of Steigerite

Color:

Canary yellow, Olive green.

Density:

2.55

Habit:

Pulverulent - Forms a loose, poorly-coherent powdery mass.

Hardness:

2.5-3 - Finger Nail-Calcite

Luminescence:

Fluorescent.

Luster:

Waxy

Streak:

yellow

Optical Properties of Steigerite

Gladstone-Dale:

CI meas= 0.051 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.051 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2897,KPDmeas= 0.2897,KC= 0.3054
Ncalc = 1.78

Optical Data:

Biaxial (+), a=1.73, b=1.734, g=1.752, bire=0.0220

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

colorless.

Calculated Properties of Steigerite

Electron Density:

Bulk Density (Electron Density)=2.55 gm/cc
note: Specific Gravity of Steigerite =2.55 gm/cc.

Fermion Index:

Fermion Index = 0.0009288266
Boson Index = 0.9990711734

Photoelectric:

PE_Steigerite= 5.28 barns/electron
U=PE_Steigerite x rElectron Density= 13.46 barns/cc.

Radioactivity:

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

Steigerite Classification

Dana Class:

40.04.05.01 (40)Hydrated Phosphates, etc

(40.04)where A+++ XO4 � x(H2O)

(40.04.05)Dana Group

40.04.05.01 Steigerite AlVO4•3(H2O) P 2₁/m, P 2 Mono

Strunz Class:

08.CE.65 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.65 Steigerite AlVO4•3(H2O) P 2₁/m, P 2 Mono

Other Steigerite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Steigerite :
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 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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

Steigerite

AlVO4•3(H2O)
Dana No: 40.04.05.01 Strunz No: 08.CE.65
Locality:

Notes:

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