Steigerite Mineral Data + 
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- 40.4.5.1 Steigerite AlVO4·3(H2O) P 21/m, P 2 Mono
- VII/C.12-10 Newberyite Mg(PO3OH)·3(H2O) P bca 2/m 2/m 2/m
- VII/C.12-20 Steigerite AlVO4·3(H2O) P 21/m, P 2 Mono
- VII/C.12-30 Schoderite Al2(PO4)(VO4)·8(H2O) P 21/m 2/m
- VII/C.12-40 Metaschoderite Al2(PO4)(VO4)·6(H2O) P 2/m 2/m
- VII/C.12-50 Kankite FeAsO4·3.5(H2O) Unk Mono
General Steigerite Information |
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 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. | ||
Steigerite Image | |||
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Images:
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Steigerite Crystallography |
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| 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: |
MonoclinicSpace Group: P 21/m, P 2 | ||
| X Ray Diffraction: |
By Intensity(I/Io): 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 |
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| 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 |
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| 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 |
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| 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 |
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| Electron Density: |
relectron=2.55 gm/cc |
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| Fermion Index |
Fermion Index = 0.00092 Boson Index = 0.99908 |
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| Photoelectric: |
PESteigerite = 5.28 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Steigerite is Not Radioactive |
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Steigerite Classification |
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| Dana Class: |
40.4.5.1 (40)Hydrated Phosphates, etc | ||
| (40.4)where A+++ XO4 · x(H2O) | |||
| (40.4.5)Dana Group | |||
| Strunz Class: |
VII/C.12-20 VII - Phosphates, Arsenates and Vanadates | ||
| VII/C - Water-bearing phosphates without unfamiliar anions. cations of medium and small size: Be and Mn, Fe, Cu, Zn, Mg | |||
| VII/C.12 - Newberyite - Kankite series | |||
Other Steigerite Information |
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| 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris Search for Steigerite using: Visit our Advertisers for Steigerite : Translate Steigerite Mineral Data : Ask about Steigerite here : Print or Cut-and-Paste your Steigerite Specimen Label here :
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