a variety of amphibole, occurring in greenish bladed crystals or in masses.
Historical Examples

The actinolite slate is dark green, and formed by an almost insensible gradation from the mica slate.
In the Arctic Seas Francis Leopold McClintock

Byssolite, bis′o-līt, n. an olive-green variety of actinolite, in long crystals.
Chambers’s Twentieth Century Dictionary (part 1 of 4: A-D) Various

It is entirely composed of a slaty rock, traversed by numerous veins of actinolite.
A Guide to the Mount’s Bay and the Land’s End John Ayrton Paris

actinolite is a green silicate of lime, magnesia, and iron 322 especially common in certain metamorphic rocks.
Geology William J. Miller

a green mineral of the amphibole group consisting of calcium magnesium iron silicate. Formula: Ca2(Mg,Fe)5Si8O22(OH)2
A greenish variety of amphibole. Actinolite is a monoclinic mineral, and occurs in long, slender, green needlelike crystals, or in fibrous, radiated forms in metamorphic rocks. Chemical formula: Ca2(Mg,Fe)5Si8O22OH2.

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