Zimbabweite is a mineral; formula . 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. References Sodium minerals Potassium minerals Lead minerals Arsenic minerals Niobium minerals Tantalum minerals Titanium minerals Oxide minerals Orthorhombic minerals Minerals described in 1986