Amphibole

Amphibole is a group of inosilicate minerals. They form prism or needlelike crystals.[1]

Amphibole (Tremolite)

They are double chain SiO
4 tetrahedra, linked at the vertices. Usually they contain ions of iron and/or magnesium in their structures. Amphiboles can be green, black, colorless, white, yellow, blue, or brown.[2]

References
  1. "Amphibole". Dictionary of Geology. Retrieved 2013-01-21.
  2. Mindat, Amphibole Supergroup
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