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(c) Mineral Picture courtesy of www.yuprocks.com
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.

  

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