Zimbabweite
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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.
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