Zimbabweite found at its only known locality worldwide
|Crystal class||Dipyramidal (mmm) |
H-M symbol: (2/m 2/m 2/m)
|Unit cell||a = 12.23 Å, b = 15.29 Å |
c = 8.66 Å, Z = 4
Zimbabweite is a mineral; formula (Na,K)2PbAs4(Nb,Ta,Ti)4O18. 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.
Original source: https://en.wikipedia.org/wiki/ Zimbabweite. Read more