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Named for the German biologist Lorenz Oken. Specimens often found as “cotton ball” formations because the crystals are straight and fibrous and they radiate out in orb like structures.

Okenite Polished
Okenite Classification
Common Name Okenite
Species Okenite
Okenite Optical Properties
Transparency Translucent-Transparent
Refractive Index 1.512-1.542
Birefringence 0.003- 0.010
Optic Character Biaxial
Optic Sign Negative
Fluorescence SWUV: Inert
LWUV: Inert
Pleochroism None, None
Okenite Characteristic Physical Properties
Hardness 4.5-5
Streak White
Luster Pearly, Vitreous
Stability Brittle
Fracture Conchoidal
Cleavage Good, perfect
Okenite Chemistry & Crystallography
Chemical Name calcium silicate hydrates
Chemical Formula Ca3[Si6O15]•6(H2O)

Crystal System Triclinic
Chemistry Classification Silicate

Okenite Colors

  • Blue Okenite Blue
  • White Okenite White
  • Gray Okenite Gray
  • Yellow Okenite Yellow

Countries of Origin

Romania; United States of America (the); Hungary; Iceland; Costa Rica; India; New Zealand; Azerbaijan; Canada; Austria; Unknown; Norway; Russian Federation (the); Denmark; Italy; Mexico; Antarctica; Australia; Chile; Germany; United Kingdom of Great Britain and Northern Ireland (the)


Extremely fragile

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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.