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Steigerite Mineral Data

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General Steigerite Information

Help on Chemical  Formula: Chemical Formula: AlVO4•3(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Al(VO4)•3(H2O)
Help on Environment: Environment: In sandstone.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1935
Help on Locality: Locality: Sullivan Brothers claim, Cypsum Valley, San Miguel County, Colorado, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for George Steiger (1869-1944), Chief chemist, U. S. Gological Survey.
Help on Name Pronunciation: Name Pronunciation: Steigerite + Pronunciation Say STEIGERITE

Steigerite Image

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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

Help on Axial Ratios: Axial Ratios: a:b:c =0.4736:1:0.4416
Help on Cell Dimensions: Cell Dimensions: a = 11.84, b = 25, c = 11.04, Z = 24; beta = 110.16° V = 3,067.63 Den(Calc)= 2.55
Help on Crystal System: Crystal System: Monoclinic Space Group: P 21/m, P 2
Help on X Ray Diffraction: 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

Help on Color: Color: Canary yellow, Olive green.
Help on Density: Density: 2.55
Help on Habit: Habit: Pulverulent - Forms a loose, poorly-coherent powdery mass.
Help on Hardness: Hardness: 2.5-3 - Finger Nail-Calcite
Help on Luminescence: Luminescence: Fluorescent.
Help on Luster: Luster: Waxy
Help on Streak: Streak: yellow

Optical Properties of Steigerite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Biaxial (+), a=1.73, b=1.734, g=1.752, bire=0.0220
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): colorless.
Help on Pleochroism (z): Pleochroism (z): colorless.

Calculated Properties of Steigerite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.55 gm/cc
note: Specific Gravity of Steigerite =2.55 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0009288266
Boson Index = 0.9990711734
Help on Photoelectric: Photoelectric: PESteigerite = 5.28 barns/electron
U=PESteigerite x rElectron Density= 13.46 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Steigerite is Not Radioactive

Steigerite Classification

Help on  Dana Class: Dana Class: (40)Hydrated Phosphates, etc
  (40.04)where A+++ XO4 � x(H2O)
  (40.04.05)Dana Group Steigerite AlVO4•3(H2O) P 21/m, P 2 Mono
Help on  Strunz Class: 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

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: 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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Dana No: Strunz No: 08.CE.65





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