Tephroite

Refractive Index : 1.825 – 1.770

Optical Characteristic : DR, B-, AGG

Specific Gravity : 4.11

Formula : Mn2SiO4

Crystal System : Orthorhombic

Variety/Species : All

Species/Group : Tephroite

Birefringence : 0.037 – 0.047

Dispersion :

Hardness : 6

Toughness : poor

Ultrasonic : Never

Steam : Never

UV Long : Inert

UV Short : Inert

Pleochroism : 3 colors

Strength : weak to moderate

Pleochroism Colors : Moderate: Greenish blue/ reddish/ brownish red.

Heat : sensitive

Acids : sensitive

Light : stable

Polish Luster : vitreous to greasy

Fracture : conchoidal to uneven

Fracture Luster :

Clarity Type : N/A

Tones : N/A

Saturations : N/A

Cause of Color :

Enhancements : none

Cleavage : distinct

Color Range : Reddish brown, pink salmony pink, blue-green, green-blue, olivegreen, gray reddish, brownish, pinkish, greenish, grayish

Transparency : translucent to opaque

Phenomena : None

Separations : Tephroite from-

Identifying Characteristics and information
Brittle but takes a good polish.
Makes good cabochons but faceted material is unknown

Spectral Data
not diagnostic.

Trade Names and Misnomers
Tephroite

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