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Actinolite

Mineral Data
☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Strunz: 
9.DE.10
Physical Properties
Crystal System: 
Monoclinic - Prismatic
Streak: 
White
Hardness: 
5.0 - 6.0
Tenacity: 
brittle
Synonyms
Synonyms: 
Aktinolith
Photos