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Deriving its name from a locality in the Swiss Alps, tremolite is a member of the amphibole group, a complex series of silicate minerals. It forms in thin, parallel fibers, sometimes producing a distinct cat's eye effect when cut in cabochons. Tremolite comes in a variety of colors ranging from white, brown, colorless, gray, light green, light yellow and pink-violet. This gem sometimes occurs as fine, needle-like inclusions in emerald and quartz.

Tremolite Polished
Tremolite Classification
Common Name Tremolite
Species Tremolite
Tremolite Optical Properties
Transparency Transparent - Translucent
Dispersion Strength: Weak Fire
Refractive Index 1.560-1.643
Birefringence 0.017-0.027
Optic Character Biaxial
Optic Sign Negative
Polariscope Reaction Aggregate (AGG), Doubly Refractive (DR)
Fluorescence SWUV: Inert to moderate orange to yellow
LWUV: Inert to moderate orange or pink
Pleochroism Unobservable
Tremolite Characteristic Physical Properties
Hardness 5-6
Streak White
Specific Gravity 2.950-3.070
Toughness Poor
Luster Vitreous, Silky
Fracture Uneven
Cleavage Perfect, in one direction
Tremolite Chemistry & Crystallography
Chemical Name calcium magnesium iron silicate
Chemical Formula Ca2Mg5Si8O22(OH)2
Crystal System Monoclinic
Chemistry Classification Silicate

Tremolite Colors

  • Brown Tremolite Brown
  • Green Tremolite Green
  • White Tremolite White
  • Gray Tremolite Gray
  • Pink Tremolite Pink
  • Blue Tremolite Blue
  • Yellow Tremolite Yellow

Alternate Names

Chrome-Tremolite, Hexagonite, Grammatite

Countries of Origin

Tanzania, United Republic Of; Canada; Afghanistan; Austria; United States of America (the); Norway; China; Italy; Australia; France; Switzerland; Germany

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Tim Matthews


Tim Matthews

Tim Matthews is President and Chief Executive Officer of Jewelry Television® (JTV), as well as a member of the company's Board of Directors. He oversees and leads all aspects of the company's powerful omni-digital retail platform that uniquely specializes in fine jewelry and gemstones. His passion for business and gemstones has led him to become a recognized expert in the field of gemology. He is a life member of the Gemmological Association of Great Britain (Gem-A) and has earned Gem-A's highest degrees, the Gemmology (FGA) and Diamond (DGA) diplomas. He is also a Graduate Gemologist (GG) of the Gemological Institute of America (GIA) and has also completed GIA's Graduate Diplomas in Diamonds, Colored Stones and Pearls. Under his leadership, JTV has become the leader in the sourcing and selling of color gemstones and jewelry.

This page was created on June 27, 2014.

This page was last edited on October 24, 2019.