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Actinolite is an amphibole silicate mineral with the chemical formula .

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WordNet 2.0 Dictionary

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1. a green mineral of the amphibole group; calcium magnesium iron silicate
(hypernym) amphibole
(member-holonym) amphibole group

Webster's Revised Unabridged Dictionary (1913)

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A bright green variety of amphibole occurring usually in fibrous or columnar masses.

Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About

Mineralogy Database Dictionary

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General Information:
 Chemical Formula:
(Molecular Weight = 875.45 gm)
Calcium 9.16 % Ca
Magnesium 8.33 % Mg
Iron 12.76 % Fe
Silicon 25.66 % Si
Hydrogen 0.23 % 
Oxygen 43.86 % 
 Empirical Formula:
Metamorphic rocks.
 IMA Status:
Approved IMA 1978
Common world wide.
 Name Origin:
From the Greek, aktinos, meaning "ray" in allusion to actinolite's fibrous nature.
Physical Properties:
[110] Perfect, [110] Perfect
green, green black, gray green, or black.
2.98 - 3.1, Average = 3.04
Translucent to transparent
Bladed - Aggregates of thin lath-like crystals (e.g. kyanite)., Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite), Fibrous - Crystals made up of fibers.
5.5 - Knife Blade
Vitreous (Glassy)
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Dizionario inglese-italiano 1.0.012

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