Arsenoclasite
A variety of Minerals
What is Arsenoclasite?
Arsenoclasite is red or dark orange brown in color. The mineral rarely occurs as crystals; rather it has either a massive or granular habit. When crystals are present, they are no larger than 5 millimetres (0.20 in). Arsenoclasite has been found in association with adelite, allactite, barite, calcite, dolomite, gatehouseite, hausmannite, hematite, manganoan ferroan calcite, sarkinite, and shigaite. The mineral occurs in fissures of metamorphosed Fe-Mn ore bodies and sedimentary Fe-Mn deposits.
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Key Characteristics
Composition of Arsenoclasite
A 1971 study identified the mineral's structure as an array of oxygen atoms in a double hexagonal close packed pattern. However, a 1977 study discovered that all the manganese ions in arsenoclasite are six-coordinated, a constraint this structure cannot permit without severe distortion. The 1977 study identified arsenoclasite as isostructural to Co5(PO4)2(OH)4 and Mn5(PO4)2(OH)4.
Quick Facts
Physical Properties
- Color
- Red
- Hardness (Mohs)
- 5 - 6
- Density
- 4.27 g/cm³
Chemical Properties
- Chemical Formula
- Mn2+5(AsO4)2(OH)4
- Elements
- As, H, Mn, O
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