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Dolomite is a white to brownish and sometimes pink-colored mineral named for French mineralogist Dodat Gratet de Dolomieu in 1791. Specimens are usually found in crystal clusters and have been known to be large in size. Transparent dolomite gems can be difficult to find due to their cleavage and low hardness value and are usually preferred as a collectors stone.

Dolomite Polished
Dolomite Classification
Common Name Dolomite
Species Dolomite
Dolomite Optical Properties
Transparency Transparent - Opaque
Dispersion Strength: Weak Fire
Refractive Index 1.502-1.698
Birefringence 0.179-0.185
Optic Character Uniaxial
Optic Sign Negative
Polariscope Reaction Aggregate (AGG), Doubly Refractive (DR)
Fluorescence SWUV: Variable
LWUV: Variable
Pleochroism None
Dolomite Characteristic Physical Properties
Hardness 3.5-4
Streak White
Specific Gravity 2.800-2.950
Toughness Poor
Luster Vitreous, Pearly
Stability Poor
Fracture Subconchoidal
Cleavage Perfect, in one direction
Dolomite Chemistry & Crystallography
Chemical Name calcium magnesium carbonate
Chemical Formula CaMg(CO3)2
Crystal System Trigonal
Chemistry Classification Carbonate

Dolomite Colors

  • Pink Dolomite Pink
  • Brown Dolomite Brown
  • Blue Dolomite Blue
  • Colorless Dolomite Colorless
  • White Dolomite White
  • Gray Dolomite Gray

Alternate Names


Countries of Origin

United States of America (the); Bolivia (Plurinational State of); Spain; Canada; Austria; China; Ireland; Namibia; Brazil; Mexico; Israel; France; Peru

Sisk Gemology Reference

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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.