Formula: (Zn,Co,Ni)6(SO4)(OH,Cl)10 . 5H2O
Origin of name: For André Guarino, French mineral collector
Crystal system: Hexagonal
Crystal class: 6
Twinning:
Unit cell:
Colour: Pink
Diaphaneity: Transparent
Luster: Vitreous to pearly
Habit: Thin hexagonal crystals to 0.04 x 0.2 mm in aggregates
Hardness:
Specific gravity: 2.80
Cleavage: 1; {001} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments: Soluble in HCl
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