Thaumasite

Refractive Index : 1.507-1.464

Optical Characteristic : DR, U-

Specific Gravity : 1.91

Formula : Ca38i(CO3)(804)(OH)6.12(H2O)

Crystal System : Hexagonal

Variety/Species : All

Species/Group : Thaumasite

Birefringence : .036

Dispersion : none

Hardness : 3.5

Toughness : poor

Ultrasonic : Never

Steam : Never

UV Long : Inert

UV Short : Inert to moderate

Pleochroism : None

Strength : N/A

Pleochroism Colors : None

Heat : sensitive

Acids : sensitive

Light : stable

Polish Luster : vitreous to greasy

Fracture : subconchoidal

Fracture Luster : none

Clarity Type : N/A

Tones : N/A

Saturations : N/A

Cause of Color : None

Enhancements : None

Cleavage : Indidtinct

Color Range : Colorless, white

Transparency : Transparent to translucent

Phenomena : Chatoyancy

Separations : Thaumasite from-

Identifying Characteristics and information
Brittle. May cut catseye cabochons but the effect is fairly weak. Phosphorescene.

Spectral Data
Not diagnostic

Trade Names and Misnomers
Thaumasite

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