Thulite

Refractive Index : 1.701-1.695

Optical Characteristic : DR, B+, AGG

Specific Gravity : 3.09

Formula : Ca2AI3(SiO4)3(OH)=Ca2AIAI1(SiO4)(Si2O7)O(OH)

Crystal System : Orthorhombic

Variety/Species : Zoisite

Species/Group : Epidote Group

Birefringence : 0.006

Dispersion : 0.021

Hardness : 6 to 7

Toughness : Fair to poor

Ultrasonic : Uaually safe

Steam : Usually safe

UV Long : Inert

UV Short : Inert

Pleochroism : 3 Colors

Strength : Weak to moderate

Pleochroism Colors : Weak to moderate : Pale pink/colorless/yellow, Or dark pink/pink/yellow.

Heat : Fusibite

Acids : Attacked by acids and/or chemicals

Light : Stable

Polish Luster : Vitreous

Fracture : Conchoidal to uneven

Fracture Luster : Vitreocs to dull

Clarity Type : N/A

Tones : N/A

Saturations : N/A

Cause of Color : Manganese

Enhancements : None

Cleavage : Perfect 1 direction

Color Range : Pink, often gray or white mottling or streaking.

Transparency : Transparent to Opaque

Phenomena : Chatoyancy

Separations : Thulite from-
Rhodonite : RI, color, appearance

Identifying Characteristics and information
Thulite is of the Zoisite species which is part of the Epidote Group.

No singular identifying characteristics. Use a combination of properties.

Spectral Data
Not diagonistic.

Trade Names and Misnomers
Rosaline
Thulite
Unionite

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