Tremolite – Chrome

Group: Silicates – inosilicates

Chemical composition: Ca2(Mg,Fe)5Si8O22(OH)2Cr

Colors: White, light to dark gray, light yellow, light to dark green, light pink to light purple. Rarely colorless

Hardness: 5 to 6

Formation: Vitreous, silky luster

Principal Sources: Colorado, New York, Connecticut, Italy, Switzerland

Special Notes: Tremolite rich in the element chromium, giving it an emerald-green color.