Chemistry:Zimbabweite

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Zimbabweite
Zimbabweite.jpg
Zimbabweite found at its only known locality worldwide
General
CategoryOxide minerals
Formula
(repeating unit)
(Na,K)2PbAs4(Nb,Ta,Ti)4O18
Strunz classification4.JA.40
Crystal systemOrthorhombic
Crystal classDipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m)
Space groupCcmb
Unit cella = 12.23 Å, b = 15.29 Å
c = 8.66 Å, Z = 4
Identification
ColorYellow, yellow-brown
|re|er}}Adamantine
References[1]

Zimbabweite is a mineral; formula (Na,K)2PbAs4(Nb,Ta,Ti)4O18.[1] It is generally classed as an arsenite but is notable for also containing niobium and tantalum. A yellow brown mineral with orthorhombic crystal habit and a hardness of 5. It was discovered in 1986 in kaolinized pegmatite, i.e. weathered to clay, in Zimbabwe.[1]

References