Mineralogy Database

Alarsite Mineral Data

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General Alarsite Information

Help on Chemical  Formula: Chemical Formula: AlAsO4
Help on Composition: Composition: Molecular Weight = 165.90 gm
   Aluminum  16.26 %  Al   30.73 % Al2O3
   Arsenic   45.16 %  As   69.27 % As2O5
   Oxygen    38.58 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Al(AsO4)
Help on Environment: Environment: A product of fumarolic exhalations.
Help on IMA Status: IMA Status: Approved IMA 1994 (Dana # Added)
Help on Locality: Locality: The Tolbachik Main fracture eruption, Kamchatka, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named from its chemical composition of Aluminum and Arsenic.
Help on Name Pronunciation: Name Pronunciation: Alarsite Say ALARSITE
Help on Synonym: Synonym: ICSD 33254
  PDF 31-2

Alarsite Image

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Comments: Small thread-like alarsite fragment held to sample peg by a drop of glue.
Location: Tolbachik Volcano, Main Fracture, North Breakthrough, Kamchatka Peninsula, Russia. Scale: Peg Size 2 mm.
© Diederik Visser

Alarsite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:2.23136
Help on Cell Dimensions: Cell Dimensions: a = 5.031, c = 11.226, Z = 3; V = 246.07 Den(Calc)= 3.36
Help on Crystal System: Crystal System: Trigonal - Trapezohedral H-M Symbol (3 2) Space Group: P 3121,P 3221
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.442(1), 4.06(0.31), 4.36(0.2),

Physical Properties of Alarsite

Help on Cleavage: Cleavage: None
Help on Color: Color: Colorless, Yellowish, Pale green, Bluish.
Help on Density: Density: 3.32 - 3.35, Average = 3.33
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Anhedral Grains - Granular minerals without the expression of crystal shapes
Help on Habit: Habit: Encrustations - Forms crust-like aggregates on matrix.
Help on Hardness: Hardness: 3 - Calcite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Alarsite

Help on Dichroism (e): Dichroism (e): colorless.
Help on Dichroism (w): Dichroism (w): colorless.
Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.027 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.019 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1792,KPDmeas= 0.1805,KC= 0.1758
Ncalc = 1.58 - 1.59
Help on Optical Data: Optical Data: Uniaxial (+), w=1.596, e=1.608, bire=0.0120.

Calculated Properties of Alarsite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.16 gm/cc
note: Specific Gravity of Alarsite =3.36 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.000185164
Boson Index = 0.999814836
Help on Photoelectric: Photoelectric: PEAlarsite = 31.58 barns/electron
U=PEAlarsite x rElectron Density= 99.79 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Alarsite is Not Radioactive

Alarsite Classification

Help on  Dana Class: Dana Class: (38)Anhydrous Phosphates, etc
  (38.04)A+ XO4
  (38.04.02)Berlinite Group Berlinite AlPO4 P 3121,P 3221 3 2 Alarsite! AlAsO4 P 3121,P 3221 3 2 Rodolicoite! FePO4 R 3121 3 2
Help on  Strunz Class: Strunz Class: 08.AA.05 08 - PHOSPHATES, ARSENATES, VANADATES
  08.A - Phosphates, etc. without additional anions, without H2O
  08.AA -With small cations (some also with larger ones)
08.AA.05 Alarsite! AlAsO4 P 3121,P 3221 3 2
08.AA.05 Berlinite AlPO4 P 3121,P 3221 3 2
08.AA.05 Rodolicoite! FePO4 R 3121 3 2

Other Alarsite Information

Help on References: References: NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.80,p1328,1995) OPTIC PROP.(MinRec)
Help on See Also: See Also: Links to other databases for Alarsite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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


Dana No: Strunz No: 08.AA.05





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