Kangite

Kangite is an exceedingly rare mineral, a natural form of scandium oxide, though its is an impure and vacant scandia, with the formula (Sc,Ti,Al,Zr,Mg,Ca,□)₂O₃. In terms of chemistry it scandium-analogue of tistarite (both discovered in the famous Allende meteorite), hematite, corundum, eskolaite, karelianite, bixbyite, avicennite, and yttriaite-(Y). Kangite is one of sparse scandium minerals.^[1][2][3][4]

References

1. Ma, C., Tschauner, O., Beckett, J.R., Rossmann, G.R., and Liu, W., 2013: Kangite, (Sc,Ti,Al,Zr,Mg,Ca,□)₂O₃, a new ultra-refractory scandia mineral from the Allende meteorite: Synchrotron micro-Laue diffraction and electron backscatter diffraction. American Mineralogist 98(5-6), 870-878
2. Mindat, Kangite, http://www.mindat.org/min-42879.html
3. Mindat, Tistarite, http://www.mindat.org/min-38695.html
4. Mindat, Yttriaite-(Y), http://www.mindat.org/min-40471.html