Formula: NiSO4.6H2O
Origin of name: for Jan Retgers, Dutch crystallographer
Crystal system: tetragonal
Crystal class: 422
Twinning:
Unit cell:
Colour: blue-green
Diaphaneity:
Luster: vitreous
Habit: crystals thick tabular, prismatic, elongated on c-axis, fibrous crusts and veinlets, twisted tufts
Hardness: 2.5
Specific gravity: 2.07
Cleavage: 2; {001} perfect, {110} traces
Tenacity:
Streak: greenish white
Synonyms/varieties:
Comments: dimorphous with nickel-hexahydrite, soluble in water
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