Alarsite Mineral Data

Alarsite Mineral Data +

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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.

Synonym:

ICSD 33254

IMA1993-003

PDF 31-2

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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 - TrapezohedralH-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),

Crystal Structure:

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Machatschki F , Zeitschrift fur Kristallographie , 94 (1936) p.222-230, Die kristallstruktur von tiefquarz SiO2 und aluminiumorthoarsenat AlAsO4

View Additional jPOWD Structure files for Alarsite
[1] [2] [3] [4] [5]

Physical Properties of Alarsite

Cleavage:

None

Color:

Colorless, Yellowish, Pale green, Bluish.

Density:

3.32 - 3.35, Average = 3.33

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Alarsite

Electron Density:

r_electron=3.16 gm/cc
note: r_Alarsite=3.36 gm/cc.

Fermion Index

Fermion Index = 0.00018
Boson Index = 0.99982

Photoelectric:

PE_Alarsite= 31.58 barns/electron
U=PE_Alarsite x r_electron= 99.79 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Alarsite is Not Radioactive

Alarsite Classification

Dana Class:

38.4.2.2 (38)Anhydrous Phosphates, etc

(38.4)A+ XO4

(38.4.2)Dana Group

38.4.2.1 Berlinite AlPO4 P 3₁21,P 3₂21 3 2

38.4.2.2 Alarsite ! AlAsO4 P 3₁21,P 3₂21 3 2

38.4.2.3 Rodolicoite! FePO4 R 3121 3 2

Strunz Class:

VII/A.01-12 VII - Phosphates, Arsenates and Vanadates

VII/A - Waterfree phosphates [PO4]3- without unfamiliar anions, cations of small size: Li, Be, Al

VII/A.01 - Berlinite - Beryllonite - Hurlbutite series

VII/A.01-10 Berlinite AlPO4 P 3₁21,P 3₂21 3 2

VII/A.01-12 Alarsite AlAsO4 P 3₁21,P 3₂21 3 2

VII/A.01-15 Rodolicoite! FePO4 R 3121 3 2

VII/A.01-20 Lithiophosphate Li3PO4 P mn2₁ mm2

VII/A.01-25 Nalipoite NaLi2PO4 Pmnb 2/m 2/m 2/m

VII/A.01-30 Beryllonite NaBePO4 P 2₁/n 2/m

VII/A.01-40 Hurlbutite CaBe2(PO4)2 P 2₁/a 2/m

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 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Alarsite

AlAsO4
Dana No: 38.4.2.2 Strunz No: VII/A.01-12
Locality:

Notes: