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Creedite Rough
Creedite Classification
Common Name Creedite
Species Creedite
Creedite Optical Properties
Transparency Translucent-Transparent
Dispersion Strength: Strong Fire
Refractive Index 1.461-1.485
Birefringence 0.024
Optic Character Biaxial
Optic Sign Negative
Creedite Characteristic Physical Properties
Hardness 4.0
Streak white
Specific Gravity 2.713-2.730
Toughness Poor
Luster Vitreous
Fracture conchoidal
Cleavage perfect
Creedite Chemistry & Crystallography
Chemical Formula Ca3SO4Al2F8(OH)2*2H2O
Crystal System Monoclinic
Chemistry Classification Halide

Creedite Colors

  • Colorless Creedite Colorless
  • White Creedite White
  • Blue Creedite Blue

Countries of Origin


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Sisk Gemology Reference

Showcasing 200 gemstones in over 1,000 pages and accompanied by more than 2,000 photos, The Sisk Gemology Reference is a must-have in every collector’s library. Each comprehensive, three-volume set features state-of-the-art photography, detailed illustrations, and scientifically precise descriptions to create an entrancing experience for gemstone amateurs and afficionados alike.

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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.