Arsenoclasite Mineral Data

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:

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

Name Pronunciation:

Arsenoclasite + Pronunciation

Synonym:

ICSD 15210

PDF 20-704

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Arsenoclasite Crystallography

$Help on X Ray Diffraction:$ 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

Color:

Orange brown, Red.

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
Ncalc = 1.79 - 1.8

Calculated Properties of Arsenoclasite

Electron Density:

Bulk Density (Electron Density)=3.90 gm/cc
note: Specific Gravity of Arsenoclasite =4.16 gm/cc.

Fermion Index:

Fermion Index = 0.0001494805
Boson Index = 0.9998505195

Photoelectric:

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

Radioactivity:

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

Arsenoclasite Classification

Dana Class:

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

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

(41.04.01)Dana Group

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

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

Strunz Class:

08.BD.10 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BD -With only medium-sized cations, (OH, etc.):RO4 = 2:1

08.BD.10 Arsenoclasite Mn5(AsO4)2(OH)4 P 2₁2₁2₁ 2 2 2

08.BD.10 Gatehouseite Mn5(PO4)2(OH)4 P 2₁2₁2₁ 2 2 2

Other Arsenoclasite Information

See Also:

Links to other databases for Arsenoclasite :
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
15 - WWW-MINCRYST

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

Arsenoclasite

Mn5(AsO4)2(OH)4
Dana No: 41.04.01.01 Strunz No: 08.BD.10
Locality:

Notes: