Formula: (Na,K)2PbAs4(Ta,Nb,Ti)4O18
Origin of name: for country; Zimbabwe
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 12.245, b = 15.287, c = 8.684
Colour: Yellow to yellow-brown, honey yellow
Diaphaneity: Translucent
Luster: Adamantine
Habit: Subhedral to euhedral crystals to 1 x 1 x 2 cm
Hardness: 5-5.5
Specific gravity: 6.20
Cleavage: 1; {010}perfect
Tenacity: Brittle
Streak: White
Synonyms/varieties:
Comments: Soluble in common acids and bases
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