Arsenoclasite Mineral Data

Arsenoclasite Mineral Data +

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General Arsenoclasite Information

Chemical Formula:

Mn5(AsO4)2(OH)4

Composition:

Molecular Weight = 620.56 gm

Manganese 44.27 % Mn 57.16 % MnO

Arsenic 24.15 % As 37.04 % As₂O₅

Hydrogen 0.65 % H 5.81 % H₂O

Oxygen 30.94 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺₅(AsO₄)₂(OH)₄

Environment:

A rare fissure mineral in a metamorphosed Fe-Mn orebody (Langban, Sweden); in a sedimentary Fe-Mn deposit (Iron Monarch quarry, Australia).

IMA Status:

Valid Species (Pre-IMA) 1931

Locality:

At Langban, Varmland, Sweden. Crystallized from the Iron Monarch quarry, Iron Knob, South Australia. Link to MinDat.org Location Data.

Name Origin:

From "arsenic" and the Greek for "breaking," for its excellent cleavage.

Synonym:

ICSD 15210

PDF 20-704

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Arsenoclasite Crystallography

Axial Ratios:

a:b:c =1.6191:1:3.2765

Cell Dimensions:

a = 9.31, b = 5.75, c = 18.84, Z = 4; V = 1,008.55 Den(Calc)= 4.09

Crystal System:

Orthorhombic - DisphenoidalH-M Symbol (2 2 2) Space Group: P 2₁2₁2₁

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.933(1), 2.739(0.75), 4.55(0.7),

Crystal Structure:

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Moore P B , Molin-Case J , American Mineralogist , 56 (1971) p.1539-1552, Crystal chemistry of the basic manganese arsenates: V. Mixed manganese, coordination in the atomic arrangement of arsenoclasite

Physical Properties of Arsenoclasite

Cleavage:

[010] Perfect

Color:

Orange brown, Red.

Density:

4.16

Diaphaniety:

Transparent

Hardness:

5-6 - Between Apatite and Orthoclase

Luster:

Adamantine

Optical Properties of Arsenoclasite

Gladstone-Dale:

CI meas= -0.005 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.022 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1967,KPDmeas= 0.1933,KC= 0.1923

Optical Data:

Biaxial (-), a=1.787, b=1.81, g=1.816, bire=0.0290, 2V(Calc)=52, 2V(Meas)=53.433.

Calculated Properties of Arsenoclasite

Electron Density:

r_electron=3.90 gm/cc
note: r_{Arsenoclasite}=4.16 gm/cc.

Fermion Index

Fermion Index = 0.00014
Boson Index = 0.99986

Photoelectric:

PE_{Arsenoclasite}= 28.33 barns/electron
U=PE_{Arsenoclasite} x r_electron= 110.52 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Arsenoclasite is Not Radioactive

Arsenoclasite Classification

Dana Class:

41.4.1.1 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.4)where (A B)5 (XO4)2 Zq

(41.4.1)Dana Group

41.4.1.1 Arsenoclasite Mn5(AsO4)2(OH)4 P 2₁2₁2₁ 2 2 2

41.4.1.2 Gatehouseite Mn5(PO4)2(OH)4 P 2₁2₁2₁ 2 2 2

Strunz Class:

VII/B.11-70 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O,OH, cations of medium size: Mg, Mn, Fe, Cu, Zn, Pseudomalachite group and related compounds

VII/B.11 - Pseudomalachite group, Ludjibaite - Reppiaite series

VII/B.11-10 Ludjibaite Cu5(PO4)2(OH)4 P1 1

VII/B.11-20 Pseudomalachite Cu5(PO4)2(OH)4 P 2₁/a 2/m

VII/B.11-30 Reichenbachite Cu5(PO4)2(OH)4 P 2₁/a 2/m

VII/B.11-40 Cornwallite Cu5(AsO4)2(OH)4 P 2₁/a 2/m

VII/B.11-50 Cornubite Cu5(AsO4)2(OH)4 P1 1

VII/B.11-60 Turanite Cu5(VO4)2(OH)4 P1 1

VII/B.11-65 Gatehouseite Mn5(PO4)2(OH)4 P 2₁2₁2₁ 2 2 2

VII/B.11-70 Arsenoclasite Mn5(AsO4)2(OH)4 P 2₁2₁2₁ 2 2 2

VII/B.11-80 Reppiaite Mn5[(V,As)O4]2(OH)4 C 2/m 2/m

Other Arsenoclasite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Arsenoclasite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris

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Arsenoclasite

Mn5(AsO4)2(OH)4
Dana No: 41.4.1.1 Strunz No: VII/B.11-70
Locality:

Notes: