Alarsite Mineral Data

General Alarsite Information

Chemical Formula:

AlAsO4

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

Empirical Formula:

Al(AsO₄)

Environment:

A product of fumarolic exhalations.

IMA Status:

Approved IMA 1994 (Dana # Added)

Locality:

The Tolbachik Main fracture eruption, Kamchatka, Russia. Link to MinDat.org Location Data.

Name Origin:

Named from its chemical composition of Aluminum and Arsenic.

Name Pronunciation:

Alarsite

Synonym:

ICSD 33254

IMA1993-003

PDF 31-2

Alarsite Image

Images:

Alarsite

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

Axial Ratios:

a:c = 1:2.23136

Cell Dimensions:

a = 5.031, c = 11.226, Z = 3; V = 246.07 Den(Calc)= 3.36

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/I_o): 3.442(1), 4.06(0.31), 4.36(0.2),

Physical Properties of Alarsite

Cleavage:

None

Color:

Colorless, Yellowish, Pale green, Bluish.

Density:

3.32 - 3.35, Average = 3.33

Diaphaneity:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Hardness:

3 - Calcite

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Alarsite

Dichroism (e):

colorless.

Dichroism (w):

colorless.

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

Optical Data:

Uniaxial (+), w=1.596, e=1.608, bire=0.0120.

Calculated Properties of Alarsite

Electron Density:

Bulk Density (Electron Density)=3.16 gm/cc
note: Specific Gravity of Alarsite =3.36 gm/cc.

Fermion Index:

Fermion Index = 0.000185164
Boson Index = 0.999814836

Photoelectric:

PE_Alarsite= 31.58 barns/electron
U=PE_Alarsite x rElectron Density= 99.79 barns/cc.

Radioactivity:

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

Alarsite Classification

Dana Class:

38.04.02.02 (38)Anhydrous Phosphates, etc

(38.04)A+ XO4

(38.04.02)Berlinite Group

38.04.02.01 Berlinite AlPO4 P 3₁21,P 3₂21 3 2

38.04.02.02 Alarsite! AlAsO4 P 3₁21,P 3₂21 3 2

38.04.02.03 Rodolicoite! FePO4 R 3121 3 2

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

References:

NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.80,p1328,1995) OPTIC PROP.(MinRec)

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 :

Alarsite

AlAsO4
Dana No: 38.04.02.02 Strunz No: 08.AA.05
Locality:

Notes:

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