Mineralogy Database

Alloclasite Mineral Data

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General Alloclasite Information

Help on Chemical  Formula: Chemical Formula: (Co,Fe)AsS
Help on Composition: Composition: Molecular Weight = 165.15 gm
   Iron      8.45 %  Fe
   Cobalt   26.76 %  Co
   Arsenic  45.37 %  As
   Sulfur   19.42 %  S
           100.00 % 
Help on Empirical Formula: Empirical Formula: Co0.75Fe2+0.25AsS
Help on Environment: Environment: In calcite or quartz veins of apparently low temperature, late stage hydrothermal origin. Also in silicified, recrystallized metamorphic rock.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1866
Help on Locality: Locality: In the Elizabeth mine, Oravita (Oravicza), Romania. From the Silverfields mine, Cobalt, and the Siscoe mine, Miller Lake, Gowganda, Ontario, Canada. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek for "other", and "to break," because its cleavage was believed to be different from marcasite, which it resembles.
Help on Name Pronunciation: Name Pronunciation: Alloclasite + Pronunciation Say ALLOCLASITE
Help on Synonym: Synonym: ICSD 36395
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