Formula: (Na,K)3(Sb2O3)3(SbS3).3H2O
Origin of name: In honour of German mineral dealer and specialist in Chinese minerals Berthold Ottens (born 1942)
Crystal system: Hexagonal
Crystal class: 6
Twinning:
Unit cell: a = 14.1758, c = 5.5712
Colour: Red-brown
Diaphaneity: Translucent
Luster: Vitreous
Habit: Spherules
Hardness: 3.5
Specific gravity: 4.14 (calculated)
Cleavage: None observed
Tenacity: Brittle, irregular/uneven fracture
Streak: Yellow-brown
Synonyms/varieties:
Comments: Na-dominant analogue of cetineite
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