Mineral Information and Data:

Arseniopleite
(Ca,Na)(Na,Pb2+)Mn2+(Mn2+,Mg,Fe2+)2(AsO4)3 [CNMNC approved formula]

Named in 1888 from the Latin for the element As, and Greek for 'more' because it adds to the number of related minerals already described.

IMA status : Approved Species 2003 ()
CLASSIFICATION 
Dana
(8th edition) :
38.02.02.02  
  (38) Anhydrous Phosphates, etc
  (38.02) (A+ B++)5 (XO4)3
  (38.02.02) Alluaudite-Wyllieite Group (Alluaudite Subgroup)
  
Nickel-Strunz
(10th edition) :
08.AC.10
  (08) Phosphates, Arsenates, Vanadates
  (08.A) Phosphates, etc. without additional anions, without H2O
  (08.AC) With medium-sized and large cations
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
Unit cell: a = 11.31Å, b = 13.06Å, c = 6.86Å β = 99°
Crystal Habit: Rarely as elongated or lenticular crude crystals; more commonly granular, massive.
  
Color: Brownish-red, cherry red, grey, yellow, dark green; orange, pale apricot-orange or brownish orange in transmitted light.
Diaphaneity: Translucent to opaque
Luster: Dull
Hardness (Mohs): 3 - 4
Measured Density: 4.17 - 4.22 g/cm3
Cleavage: Distinct/Good On pseudo-{1011}
Fracture: Conchoidal
Streak: Yellowish brown
  
Geologic Setting: As fracture fillings and thin veins in banded dolostone (Sjo mine, Sweden); in a metamorphosed Fe–Mn orebody (Langban, Sweden).
Mineral Association: Rhodonite, tephroite, hedyphane, dolomite, calcite (Sj¨o mine, Sweden); calcite, berzeliite, kutnohorite, sarkinite, gonyerite, katoptrite (L°angban, Sweden)
  

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