Sellaite

Refractive Index : 1.390 – 1.378

Optical Characteristic : DR Uniaxial positive

Specific Gravity : 3.15

Formula : MgF2.

Crystal System : Tetragonal

Variety/Species : All

Species/Group : sellaite

Birefringence : 0.012

Dispersion :

Hardness : 5 to 5.5

Toughness : poor

Ultrasonic : Never

Steam : Never

UV Long : Inert

UV Short : Inert

Pleochroism : None

Strength : N/A

Pleochroism Colors : None

Heat : sensitive

Acids : sensitive

Light : stable

Polish Luster : vitreous

Fracture : conchoidal

Fracture Luster :

Clarity Type : N/A

Tones : N/A

Saturations : N/A

Cause of Color :

Enhancements : None

Cleavage : perfect 2 directions. poorly observed.

Color Range : Colorless, white, whitish

Transparency : Semitransparent to opaque

Phenomena : None

Separations : Sellaite from-

Identifying Characteristics and information
Brittle.
Extremely rare.

Spectral Data
not diagnostic

Trade Names and Misnomers
Sellaite

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