Mineral 1.0: Actinolite

Mineral 1.0

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Mineral Picture courtesy of www.yuprocks.com

Actinolite  (Tremolite)Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂

Class: Silicate
Subclass: Amphibole
Hardness: 5 - 6
Density: 3.0 - 3.4
Streak: White
Lustre: Vitreous
Habit: Aggregate of acicular grains
Colours: Greenish - white
   Crystal System: Monoclinic
Cleavage: Uneven
Fracture: Subconchoidal
Magnetism: None
Reaction with HCl: None
Identification in hand sample:
Habit and colour are best indicators.
Associations:
Metamorphosed calcareous sediments
Comments:
Higher in Fe than tremolite.



Inaccurate data? Better photos? .