Formula: Ca2(Fe,Mg)5Si8O22(OH)2
Origin of name: From ferrous iron (Fe2+) and actinolite
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Dark green to blackish green
Diaphaneity:
Luster: Vitreous, sometimes dull
Habit: Crystals long bladed or short and stout; fibrous and thin-colomnar aggregates; massive
Hardness: 5 to 6
Specific gravity: 3.51
Cleavage: 2; {110} good, {100} parting
Tenacity:
Streak:
Synonyms/varieties:
Comments: Series with tremolite and actinolite
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