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Maw-sit-sit is a rock composed primarily of kosmochlor with varying combinations and amounts of other minerals. Due to its close resemblance to jade, it was believed to be a variety of jade up until the 1960s. This gem is opaque saturated green with dark green to black veining or mottling.

Maw-Sit-Sit Polished
Maw-Sit-Sit Classification
Common Name Maw-Sit-Sit
Species Rock
Maw-Sit-Sit Optical Properties
Transparency Opaque
Refractive Index 1.530-1.740
Polariscope Reaction Aggregate (AGG)
Fluorescence SWUV: inert
LWUV: inert
Pleochroism None
Maw-Sit-Sit Characteristic Physical Properties
Hardness 6
Specific Gravity 2.460-3.150 Typical: 2.770
Toughness Good
Inclusions Maw-sit-sit will show veining or mottling with black areas of kosmochlor inclusions.
Luster Vitreous, Waxy
Fracture Granular
Cleavage None
Maw-Sit-Sit Chemistry & Crystallography
Chemical Name hydrated silicon dioxide
Chemical Formula NaCr[Si2O6]+Fe, Mg
Crystal System NA
Chemistry Classification Silicate

Maw-Sit-Sit Colors

  • Green Maw-Sit-Sit Green

Countries of Origin

Myanmar; Thailand

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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.