Actinolite
Chemical Formula	Ca2(Mg,Fe)5Si8O22(OH)2
Species	Silicates
Crystal System	Monoclinic
Mohs Scale	5-6
Specific Gravity	3.00
Color	pale to dark green, yellowish green and black. White or grey when in asbestos form
Streak	white
Luster	Vitreous, Silky
Refractive Index	n = 1.613 - 1.646 n = 1.624 - 1.656 n = 1.636 - 1.666
Diaphaneity	Transparent, Translucent
Cleavage	Distinct/Goodon
Fracture	Splintery
Crystal Habit：bladed, fibrous, radial
Geological Setting：Produced by low-grade regional or contact metamorphism of magnesium carbonate, mafic, or ultramafic rocks; Also in glaucophane-bearing blueschists. Occurs in many localities. In Austria, on Mt. Greiner, Zillertal, and at Untersulzbachtal. From Zermatt, Valais, Switzerland. At Snarum and Arendal, Norway. From the Ural Mountains, Russia. In the USA, from Gouverneur, St. Lawrence Co., New York; Franklin and Newton, Sussex Co., New Jersey; Chester, Windsor Co., Vermont; in the Fairfax quarry, Centreville, Fairfax Co., Virginia; Crestmore, Riverside Co., California; at Salida, Cha?ee Co., Colorado. Nephrite jade occurs, in the USA, south and east of Lander, Fremont Co., Wyoming; north from Cape San Martin, Monterey Co., California; and around Jade Mountain, near the Kobuk River, Alaska. Along the Fraser River, British Columbia, Canada. Around Mt. Cook, South Island, New Zealand. Fine material from the Kunlun Mountains, Sinkiang Uighur Autonomous Region, China.