Mineral Information and Data:

Melanothallite
Cu2OCl2 [CNMNC approved formula]

Named from the Greek for black and a young shoot, for the mineral’s property of turning green on exposure.

IMA status : Valid species (Pre-IMA 1870) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
10.04.04.01  
  (10) Oxyhalides and Hydroxyhalides
  (10.04) where (A)2 (O,OH) Xq
  (10.04.04)
  
Nickel-Strunz
(10th edition) :
03.DA.05
  (03) Halides
  (03.D) Oxyhalides, Hydroxyhalides and Related Double Halides
  (03.DA) With Cu, etc., without Pb
  
Crystal system: Orthorhombic System
Point group (H-M): mmm (or 2/m 2/m 2/m) — dipyramidal
  
  
  
Other Properties: H2O Soluble.

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