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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. | ||
| Name Pronunciation: |
Steigerite + Pronunciation  |
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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 Ncalc = 1.78 |
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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: |
Bulk Density (Electron Density)=2.55 gm/cc note: Specific Gravity of Steigerite =2.55 gm/cc. |
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| Fermion Index: |
Fermion Index = 0.0009288266 Boson Index = 0.9990711734 |
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| Photoelectric: |
PESteigerite = 5.28 barns/electron U=PESteigerite x rElectron Density= 13.46 barns/cc. |
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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: |
40.04.05.01 (40)Hydrated Phosphates, etc | ||
| (40.04)where A+++ XO4 · x(H2O) | |||
| (40.04.05)Dana Group | |||
| 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 | |||
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 - 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 Search for Steigerite using: Visit our Advertisers for Steigerite : A Bijoux Google Search for SteigeriteAdam's Minerals Google Search for Steigerite Cape Minerals Google Search for Steigerite Dakota Matrix Minerals Google Search for Steigerite Excalibur Mineral Corp. Google Search for Steigerite Exceptional Minerals Google Search for Steigerite John Betts Fine Minerals Search for Steigerite McDougall Minerals Google Search for Steigerite Mineral News Website Link Rock and Mineral Shows Google Search for Steigerite Weinrich Minerals, Inc. Google Search for Steigerite Ask about Steigerite here : Print or Cut-and-Paste your Steigerite Specimen Label here :
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