Formula: (Na,Ca,Fe)(Sc,Mg,Fe)Si2O6
Origin of name: For William Jervis, Italian curator
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Light green
Diaphaneity:
Luster: Vitreous
Habit: Elongated platelets
Hardness:
Specific gravity: 3.22
Cleavage: 1; {110} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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