Mineral Information and Data:

Arsenoclasite
Mn2+5(AsO4)2(OH)4 [CNMNC approved formula]

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

IMA status : Valid species (Pre-IMA 1931) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
41.04.01.01  
  (41) Anhydrous Phosphates Containing Hydroxyl or Halogen
  (41.04) where (A B)5 (XO4)2 Zq
  (41.04.01)
  
Nickel-Strunz
(10th edition) :
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
  
Crystal system: Orthorhombic System
Point group (H-M): 222 — disphenoidal
Unit cell: a = 9.31Å, b = 5.75Å, c = 18.29Å
Crystal Habit: Crystals rare, to 5 mm; granular or massive.
  
Color: Red, dark orange-brown
Diaphaneity: Translucent
Hardness (Mohs): 5 - 6
Measured Density: 4.16 g/cm3
Cleavage: Perfect on {010}
  
Geologic Setting: A rare fissure mineral in a metamorphosed Fe–Mn orebody (Langban, Sweden); in a sedimentary Fe–Mn deposit (Iron Monarch quarry, Australia).
Mineral Association: Sarkinite, adelite, allactite, calcite, dolomite, hausmannite (Langban, Sweden); gatehouseite, shigaite, hematite, hausmannite, barite, manganoan ferroan calcite (Iron Monarch quarry, Australia)
  
Synonyms/varieties: Arsenoklasite

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