Thulite
Gemstone
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Thulite is a translucent, crystalline or massive pink manganese-bearing variety of the mineral zoisite. Manganese substitutes for calcium in the structure with up to two percent Mn²⁺. Thulite is often mottled with white calcite and occurs as veins... Wikipedia
Hardness (Mohs hardness scale): 6 – 6.5
Crystal habit: Massive
Crystal system: Orthorhombic
Formula (repeating unit): (Ca,Mn)2Al3(SiO4)(Si2O7)O(OH)
Mohs scale hardness: 6.5
Optical properties: biaxial positive