Associated minerals include bismutite, mica, jarosite, alunite, cerussite, atacamite, connellite.

Occurrences include the type locality at Jackals Water, SW of Prieska, South Africa; Bygoo, Australia; the Tintic district in the East Tintic Mountains of Utah; and from Dalbeattie, Scotland.

[4] The crystal structure of bismoclite was found to be composed of linked decahedrons, specifically a square antiprism.

[7] These decahedrons consist of 2 squares with sides of 3.487 Å (O-O-O-O and Cl-Cl-Cl-Cl) connected by 8 isosceles triangles (O-Cl-O and Cl-O-Cl), with a bismuth atom at the centre.

[7] Bismoclite is a rare secondary mineral, a product of the oxidation of basic bismuth ores in the presence of active chlorine ions.