Kyawthuite

Kyawthuite (/ˈtʃɜːrˌtuːaɪt/)^[4] is a rare mineral^[2] with formula BiSbO₄.^[3] It is a natural bismuth antimonate, in which bismuth has oxidation state +3, and antimony oxidation state +5.

Kyawthuite
Kyawthuite sample on display at the Natural History Museum of Los Angeles County
General
Category	Oxide mineral
Formula	BiSbO4
IMA symbol	Kyw[1]
Crystal system	Monoclinic
Crystal class	Prismatic (2/m) (same H-M symbol)
Space group	I2/c
Unit cell	a = 5.46 Å, b = 4.89 Å c = 11.85 Å, β = 101.20° (approximated); Z = 4
Identification
References	[2][3]

Description

Kyawthuite is monoclinic, with space group I2/c, and is isostructural with clinocervantite,^[2] its trivalent-antimony-analogue.^[5] Kyawthuite is an antimony-analogue of clinobisvanite.^[6]

Occurrence

Kyawthuite was discovered in the vicinity of Mogok in Myanmar, an area famous for its variety of gemstone minerals.^[7]

Only one 0.3 gram sample of the naturally occurring form of this mineral is documented, and it is stored and on display at the Natural History Museum of Los Angeles County.^{[8] [9]}