What kind of mineral is actinolite?
Score: 4.2/5 (3 votes) actinolite, an amphibole mineral in the tremolite-actinolite series of calcium, magnesium, and iron silicates. The minerals in this series are abundant in regionally metamorphosed rocks, such as schists. Tremolite may weather to talc, and both tremolite and actinolite may alte...