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Cobaltocalcite refers to a stunning pink-red to slightly purplish-red cobalt-rich calcite mineral. Another name for this stone is cobaltoan calcite. Crystals often form as drusy masses and when faceted, gems are rarely seen in sizes greater than 2 carats.

Cobaltocalcite Polished
Cobaltocalcite Classification
Common Name Cobaltocalcite
Species Calcite
Cobaltocalcite Optical Properties
Transparency Transparent - Translucent
Dispersion Strength: Strong Fire
Refractive Index Over The Limit 1.600-1.885
Birefringence 0.285
Optic Character Uniaxial
Optic Sign Negative
Polariscope Reaction Doubly Refractive (DR)
Fluorescence SWUV: strong red
Pleochroism Dichroic, violet red to rose red
Cobaltocalcite Characteristic Physical Properties
Hardness 3-4
Specific Gravity 4.100-4.130
Toughness Poor
Fracture Subconchoidal
Cleavage Perfect, in three directions
Cobaltocalcite Chemistry & Crystallography
Chemical Formula CoCO3
Crystal System Trigonal
Chemistry Classification Carbonate

Cobaltocalcite Colors

  • Red Cobaltocalcite Red
  • Purple Cobaltocalcite Purple
  • Pink Cobaltocalcite Pink

Alternate Names


Countries of Origin

Morocco; Congo (the); Spain

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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.