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Gypsum Rough
Gypsum Classification
Common Name Gypsum
Species Gypsum

Gypsum Colors

  • Black Gypsum Black
  • White Gypsum White
  • Colorless Gypsum Colorless
  • Yellow Gypsum Yellow
  • Brown Gypsum Brown
  • Blue Gypsum Blue
  • Pink Gypsum Pink
  • Gray Gypsum Gray

Countries of Origin

Unknown; Mexico

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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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Satin Spar

Satin spar is an adjective used when the fibrous habit of a mineral gives it a satin luster.The term satin spar has been used in the past to describe calcite and aragonite, however, it is currently accepted as one variety of the mineral gypsum, along with selenite and alabaster.In addition to its ornamental uses, gypsum is also a primary component in plaster and other building materials.

Satin Spar Gypsum
Satin Spar Classification
Common Name Satin Spar
Satin Spar Optical Properties
Refractive Index 1.52-1.529
Birefringence 0.009-0.01
Fluorescence SWUV: Inert to weak brownish to greenish white
LWUV: Inert to weak brownish to greenish white
Satin Spar Characteristic Physical properties
Specific Gravity 2.25
Inclusions Satin spar is a white to cream fibrous gypsum with chatoyant effect.
Stability Fair
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.