Maw-Sit-Sit | Gemopedia

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.
Colors
Saturated Green With Dark Green To Black Veining, Mottling

Maw-Sit-Sit Classification

Common Name

Maw-Sit-Sit

Species

Maw-Sit-Sit

Variety

Colors

Saturated Green With Dark Green To Black Veining, Mottling

Alternate Names

Gemstone Groups

Key Separations

appearance and magnification

Comments

Misnomers: jade, albite, jadeite with albite intergrowth, chrome albite, chloromelaniteRI spots of 1.74 and 1.53

Maw-Sit-Sit Optical Properties

Transparency

Opaque

Refractive Index

1.53-1.74

Birefringence

Optic Character

Optic Sign

Polariscope Reaction

Aggregate (AGG)

Fluorescence

SWUV: inert
LWUV: inert

CCF Reaction

Pleochroism

None

Dispersion

Comments

Maw-Sit-Sit Chemistry & Crystallography

Chemical Name

hydrated silicon dioxide

Chemical Formula

NaCr[Si2O6]+Fe, Mg

Synthesis

Crystal System

NA

Classification

Silicate

Nature

Natural

Crystallinity

Aggregate

Comments

Maw-Sit-Sit Characteristic Physical Properties

Hardness

6

Streak

Specific Gravity

2.46-3.15 Typical:2.77

Toughness

Good

Inclusions

Maw-sit-sit will show veining or mottling with black areas of kosmochlor inclusions.

Luster

Vitreous

Stability

Fracture

Granular

Cleavage

None

Comments

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