Yellow-orange bismoclite interspersed with bismuthinite from the Alto do Giz pegmatite, Equador, Rio Grande do Norte, NE-region, Brazil. Approximate image width: 5 mm.
Platey to thin rectangular crystals, fibrous to columnar, massive
Cleavage
{001} perfect
Tenacity
Elastic
Mohs scale hardness
2-2.5
Luster
Greasy, silky, pearly, dull, earthy
Streak
White
Diaphaneity
Transparent to translucent
Specific gravity
7.36 (measured), 7.784 (calculated)
Optical properties
Uniaxial (-)
Refractive index
nω = 2.150 nε = 1.910
Birefringence
δ = 0.240
References
[2][3][4][5]
Bismoclite is a bismuth oxohalide mineral with formula BiOCl. It is the naturally occurring form of bismuth oxychloride. The name was derived from its chemical constituents. It is a secondary bismuth mineral first thought to be composed of bismuthyl ions (BiO+) and chloride anions, however, the existence of the diatomic bismuthyl ion is doubtful.[6]
It is a member of the matlockite group.
It was first described in 1935 from alluvium near bismuth-bearing pegmatites in South Africa.[3] It has been found in association with granite pegmatite and in greisen. 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]
Bismoclite is a bismuth oxohalide mineral with formula BiOCl. It is the naturally occurring form of bismuth oxychloride. The name was derived from its...
cosmetic its name is C.I. 77163. BiOCl exists in nature as the rare mineral bismoclite, which is part of the matlockite mineral group. An analogous compound...
species exist for neptunium and plutonium. Bismuth oxochloride (BiOCl, bismoclite) is a rare example of a mineral oxohalide. The crystal structure has a...
hair sprays and nail polishes. This compound is found as the mineral bismoclite and in crystal form contains layers of atoms (see figure above) that refract...
trioxide – details on the chemistry of this substance Bismutite Bismuthinite Bismoclite Eulytine Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical...
several research teams worked on in the 2010s. Bismutite Bismuthinite Bismoclite Bismite Zavaritskite Eulytine (A valid IMA mineral species, grandfathered):...
crystal structure. The group includes bismuth, lead or calcium halides: bismoclite (BiO)Cl, daubréeite (BiO)(OH,Cl), laurionite PbCl(OH), paralaurionite...