Formula: Ca2ZnSi2O7
Origin of name: Locality; Hardyston township, Franklin, New Jersey
Crystal system: Tetragonal
Crystal class: -42m
Twinning:
Unit cell:
Colour: White, pinkish to light brown
Diaphaneity: Translucent
Luster: Vitreous
Habit: Massive, granular; disseminated grains
Hardness: 3 to4
Specific gravity: 3.44
Cleavage: 3; {001} distinct, {100} and {110} indistinct
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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