Arsenoclasite (original) (raw)

A valid IMA mineral species - grandfathered

About ArsenoclasiteHide

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Formula:

Mn2+5(AsO4)2(OH)4

Colour:

Red, dark orange-brown.

Crystal System:

Orthorhombic

Name:

From the Greek αρσενικόν for "arsenic" and κλάσις for "cleavage," in allusion to its arsenic content and perfect cleavage.

Isostructural with its phosphate analogue gatehouseite.

Related to reppiaite.

May be confused with sarkinite. Arsenoclasite has a more distinct cleavage. Generally (not always) arsenoclasite has a more brownish tinge of red than sarkinite. It is redder than gatehouseite, which may overgrow it.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:364:1

IMA Classification of ArsenoclasiteHide

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Approved, 'Grandfathered' (first described prior to 1959)

Type description reference:

Classification of ArsenoclasiteHide

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8.BD.10

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
D : With only medium-sized cations, (OH, etc.):RO4= 2:1

41.4.1.1

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
4 : (AB)5(XO4)2Zq

20.8.3

20 : Arsenates (also arsenates with phosphate, but without other anions)
8 : Arsenates of Mn

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Physical Properties of ArsenoclasiteHide

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Colour:

Red, dark orange-brown.

Cleavage:

Perfect
On {010}, perfect.

Density:

4.16 g/cm3 (Measured) 4.27 g/cm3 (Calculated)

Optical Data of ArsenoclasiteHide

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RI values:

_n_α = 1.787 _n_β = 1.810 _n_γ = 1.816

2V:

Measured: 53° , Calculated: 52°

δ = 0.029

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Optical Extinction:

X = b; Y = a; Z = c.

Chemistry of ArsenoclasiteHide

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Mindat Formula:

Mn2+5(AsO4)2(OH)4

Crystallography of ArsenoclasiteHide

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Crystal System:

Orthorhombic

Class (H-M):

222 - Disphenoidal

Cell Parameters:

a = 9.31 Å, b = 5.75 Å, c = 18.29 Å

Ratio:

a:b:c = 1.619 : 1 : 3.181

Unit Cell V:

979.11 ų (Calculated from Unit Cell)

Morphology:

Massive, granular.

Crystal StructureHide

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ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0000259	Arsenoclasite	Moore P B, Molin-Case J (1971) Crystal chemistry of the basic manganese arsenates: V. Mixed manganese coordination in the atomic arrangement of arsenoclasite American Mineralogist 56 1539-1552		1971	0	293

CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of ArsenoclasiteHide

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General Appearance of Type Material:

Brownish to red massive fracture-fillings.

Place of Conservation of Type Material:

Swedish Museum of Natural History, Stockholm, Sweden; The Natural History Museum, London, England, 1931,59.

Chemical Analysis of Type Material:

Geological Setting of Type Material:

In fissures in hausmannite-impregnated dolomite.

Associated Minerals at Type Locality:

Synonyms of ArsenoclasiteHide

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Other Language Names for ArsenoclasiteHide

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Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Other InformationHide

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Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for ArsenoclasiteHide

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References for ArsenoclasiteHide

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Reference List:

**Palache, Charles, Berman, Harry, Frondel, Clifford (1951) The System of Mineralogy (7th ed.) Vol. 2 - Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Ect. John Wiley and Sons, New York.**pp.801-802

Localities for ArsenoclasiteHide

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This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

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