Physical Properties
calcium, magnesium, iron silicate: amphiole group
Ca2(Mg, Fe)5Si8O22(OH)2
Hardness = 5 - 6;
Shape: Long prismatic crystals
Color: bright to dark green, grayish green, black
Luster: vitreous (glassy), pearly, silky
Cleavage: two directions lengthwise
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Description
Actinolite is a metamorphic mineral often associated with chlorite and epidote in greenstone rocks. Usually it is intimately intermixed with these other minerals and hard to see. This is a relatively pure specimen showing the typical radiating prismatic crystal masses.
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