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Formula:
KCa2(Fe2+4Fe3+)(Si6Al2)O22Cl2
Inosilicate (chain silicate),
hastingsite root name group,
amphibole
Crystal System: Monoclinic
Specific gravity: 3.52 measured, 3.53 calculated
Hardness: 4½ to 5
Streak: Greenish grey
Colour: Greenish black, dark green
Environments
Localities
At the type locality, the Dashkesan Co-Fe deposit, Dashkesan, Dashkasan District, Azerbaijan,
potassic-chloro-hastingsite comes from amphibole
skarns in the northeast part of the deposit, where it can make
up in excess of 95% of the skarn, the remainder consisting of
quartz, chlorite,
actinolite, apatite,
epidote, magnetite,
hematite, chalcopyrite,
bornite and cobaltite
(AM 94.399).
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