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 % As2 O5
Hydrogen 0.65 % H 5.81 % H2 O
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
Arsenoclasite Crystallography
X Ray Diffraction:
By Intensity(I/Io ): 2.933(1), 2.739(0.75), 4.55(0.7),
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:
PEArsenoclasite = 28.33 barns/electronU=PEArsenoclasite x r Electron 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 21 21 21 2 2 2
41.04.01.02 Gatehouseite Mn5(PO4)2(OH)4 P 21 21 21 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 21 21 21 2 2 2
08.BD.10 Gatehouseite Mn5(PO4)2(OH)4 P 21 21 21 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: