Formula: CaFeAlSiO6
Origin of name: For Eric Essene, American geologist
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Reddish-brown
Diaphaneity:
Luster: Vitreous
Habit: Crystals long prismatic, small
Hardness: 6
Specific gravity: 3.54
Cleavage: 1; {110} perfect
Tenacity:
Streak: White
Synonyms/varieties:
Comments: Series with diopside
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