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

Of the nature of, or containing, actinolite.

nesium and calcium, with usually aluminium and iron. Some common varieties are tremolite, actinolite, asbestus, edenite, hornblende (the last name being also used as a general term for the whole species). Amphibole is a constituent of many crystalline rocks, as syenite, diorite, most varieties of trachyte, etc. See Hor…

en containing acicular crystals of other minerals, most commonly rutile, also tourmaline, actinolite, and the like.