Formula: []Na2(Mg,Fe)3(Al,Fe)2Si8O22(OH)2
Origin of name: For Charles Cross, American geologist
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Blue, grayish
Diaphaneity: Translucent
Luster: Vitreous to dull
Habit: Crystals prismatic, often lath-like, massive, fibrous, columnar, granular
Hardness: 6
Specific gravity: 3.11 to 3.21
Cleavage: 1; {110} perfect
Tenacity:
Streak: Grayish blue
Synonyms/varieties:
Comments: Series with glaucophane
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