Formula: Ca5(SiO4)2SO4
Origin of name: Named after Mr. B. Ternes of Mayen, Germany, who found the mineral and provided specimens for the study
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 6.863, b = 15.387, c = 10.181
Colour: Colourless, bright blue, pale blue, brown, light green
Diaphaneity: Transparent
Luster: Vitreous
Habit: Radial, aggregates
Hardness: 4.5
Specific gravity: 2.96
Cleavage: None
Tenacity:
Streak: White
Synonyms/varieties:
Comments:
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