Definition of Actinolite

Webster's Revised Unabridged Dictionary (1913)

Actinolite
(n.)
A bright green variety of amphibole occurring usually in fibrous or columnar masses.

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Actinolite definition was found in categories: Language, Idioms & Slang(2) Science & Technology(2) Encyclopedia(1)

Actinolite Definition from Language, Idioms & Slang Dictionaries & Glossaries

WordNet 2.0

actinolite

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

hEnglish - advanced version

actinolite

actinolite
\ac*tin"o*lite\ (&?;), n. [gr. &?;, &?;, ray + -lite.] (min.) a bright green variety of amphibole occurring usually in fibrous or columnar masses.

Actinolite Definition from Science & Technology Dictionaries & Glossaries

Mineralogy Database

Actinolite

General Information:

Chemical Formula:
Ca2(Mg,Fe++)5Si8O22(OH)2

Composition:
(Molecular Weight = 875.45 gm)
Calcium 9.16 % Ca
Magnesium 8.33 % Mg
Iron 12.76 % Fe
Silicon 25.66 % Si
Hydrogen 0.23 % H
Oxygen 43.86 % O

Empirical Formula:
Ca2Mg3Si8O22(OH)2Fe2+2

Environment:
Metamorphic rocks.

IMA Status:
Approved IMA 1978

Locality:
Common world wide.

Name Origin:
From the Greek, aktinos, meaning "ray" in allusion to actinolite's fibrous nature.
Physical Properties:

Cleavage:
[110] Perfect, [110] Perfect

Color:
green, green black, gray green, or black.

Density:
2.98 - 3.1, Average = 3.04

Diaphaniety:
Translucent to transparent

Habits:
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.

Hardness:
5.5 - Knife Blade

Luminescence:
Non-fluorescent.

Luster:
Vitreous (Glassy)

Streak:
white
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