Formula: Ni3(CO3) (OH)4 . 4H2O
Origin of name: Named after Antonio Gil y Zarate (1793-1861), Spanish diplomat, general director of public education, and counselor of state.
Crystal system: Cubic/Isometric
Crystal class: Unknown
Twinning:
Unit cell: a = 6.16
Colour: Emerald-green
Diaphaneity: Transparent to translucent
Luster: Vitreous to greasy
Habit: Massive, compact; mammillary crusts
Hardness: 3-3.5
Specific gravity: 2.57 to 2.69
Cleavage: None
Tenacity: Brittle, conchoidal fracture
Streak: Light green
Synonyms/varieties: Emerald nickel, texasite
Comments: Also from meteorites
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