Formula: Zn2(PO4)(OH)
Origin of name: for Percy Conventry Tarbutt, director of the Broken Hill Explaration Co., Zambia, who collected some of the first specimens at Broken Hill (now Kabwe).
Crystal system: Triclinic
Crystal class: 1
Twinning:
Unit cell: a = 5.657, b = 6.432, c = 5.521, α = 102.45°, β = 87.6°, γ = 102.567°
Colour: Colourless, white, yellowish, brownish, reddish, greenish
Diaphaneity: Transparent to translucent
Luster: Vitreous, pearly on cleavage
Habit: Crystals short prismatic or equant, deeply striated, rounded, aggregates, crusts, wheat sheaf or saddle-shaped aggregates
Hardness: about 4
Specific gravity: 4.19
Cleavage: 1; {010} perfect
Tenacity: Brittle, uneven fracture
Streak: White
Synonyms/varieties: Salmoite
Comments: Fluorescent
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