Actinolite

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Description

A green to black mineral composed of calcium-magnesium silicate. Actinolite mixed with tremolite forms nephrite, a translucent green mineral that is one of the forms of jade. Actinolite deposits occur in Great Britain, Russia, Japan, China, Austalia, Brazil, Canada (British Columbia), and the U.S. (Alaska, California, Wyoming and Vermont). The transparent to opaque stone is used as a filler in paints and ceramics.

Synonyms and Related Terms

nephrite

Other Properties

Monoclinic system with fibrous or granular crystalline masses.

Luster = vitreous to silky. Streak = colorless

Cleavage is perfect in two directions; fracture is splintery

Composition Ca2(MgFe)5Si8O22(OH)2
Mohs Hardness 5.0-6.0
Density 3.0-3.2
Refractive Index 1.60-1.64

Additional Information

° Mineralogy Database: actinolite

Sources Checked for Data in Record

  • C.W.Chesterman, K.E.Lowe, Audubon Society Field Guide to North American Rocks and Minerals, Alfred A. Knopf, New York, 1979
  • Website address 1 Comment: Mineralogy Database: actinolite
  • Website address 1 Comment: Mineralogy Database: actinolite (accessed Sept. 2007)
  • C.W.Chesterman, K.E.Lowe, Audubon Society Field Guide to North American Rocks and Minerals, Alfred A. Knopf, New York, 1979 Comment: streak=colorless
  • Website address 1 Comment: Mineralogy Database: actinolite (accessed Sept. 2007); sp. grav.=2.98-3.1; hardness=5.5
  • Website address 3 Comment: MinDat.org: actinolite (accessed Sept. 2007); sp. grav.=3.03-3.24; streak=white; cleavage=good in one direction

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