Kangite

Kangite is an exceedingly rare scandium mineral, a natural form of impure scandium oxide (Sc₂O₃), with the formula (Sc,Ti,Al,Zr,Mg,Ca,□)₂O₃. It crystalizes in the cubic crystal system diploidal class.[1] In terms of chemistry it scandium-analogue of tistarite. Both kangite and tistarite were discovered in the Allende meteorite.[2][1][3][4]

References

Mindat, Kangite, http://www.mindat.org/min-42879.html
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
Mindat, Tistarite, http://www.mindat.org/min-38695.html
Mindat, Yttriaite-(Y), http://www.mindat.org/min-40471.html

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[Mindat-1] Mindat, Kangite, http://www.mindat.org/min-42879.html

[2] 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

[3] Mindat, Tistarite, http://www.mindat.org/min-38695.html

[4] Mindat, Yttriaite-(Y), http://www.mindat.org/min-40471.html