Maw-Sit-Sit

Rock

by Tim Matthews
Published: June 2014
Modified: August 2021
Maw-Sit-Sit Polished Maw-Sit-Sit Jewelry

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.

General Information

Common Name
Maw-Sit-Sit
Species
Rock
Transparency
Opaque
Refractive Index
1.530-1.740
Polariscope Reaction
Aggregate (AGG)
Fluorescence
SWUV: inert
LWUV: inert
Pleochroism
None
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
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; Unknown; Thailand