Material Index
| Name | Formula | Classifications | Members | Image | Lines | Spectra | Techniques | Tags |
|---|---|---|---|---|---|---|---|---|
| Collophane | Ca5(PO4)3(OH,F,Cl) | Apatite | — | 6 | 0 | — | Variety, Orthophosphate , Phosphate | |
| Colomeraite | NaTiIIISi2O6 | Clinopyroxene | — | 0 | 0 | — | Mineral, Silicate | |
| Coloradoite | HgTe | Sphalerite (group) | — | 0 | 0 | — | Mineral, Telluride | |
| Colquiriite | CaLiAlF6 | — | — | 1 | 0 | — | Mineral, Halide | |
| Columbite-(Mn) | MnIINb2O6 | Columbite-(Mn)-Tantalite-(Mn) | — | 0 | 0 | — | Mineral, Niobate | |
| Columbite-(Mn)-Tantalite-(Mn) | MnIINb2O6 - MnIITa2O6 | — | Columbite-(Mn), Tantalite-(Mn) | 0 | 0 | — | Series | |
| Congolite | FeII3B7O13Cl | Boracite (group) | — | 0 | 0 | — | Mineral, Borate , Halide | |
| Cookeite | (Al,Li)3Al2(Si,Al)4O10(OH)8 | Chlorite (group) | — | 1 | 0 | — | Mineral, Aluminosilicate , Hydroxide | |
| Copper | Cu | — | — | 13 | 1 | SXES | Metal , Mineral , Element | |
| Copper(II) hydroxide | Cu(OH)2 | — | — | 5 | 0 | — | Hydroxide, Compound | |
| Cordierite | Mg2Al4Si5O18 | — | — | 3 | 0 | — | Mineral, Aluminosilicate | |
| Corundum | Al2O3 | Hematite (group), Alumina | Sapphire, Eu doped, Ruby, Sapphire | 17 | 2 | CL/SEM, SXES | Mineral, Simple oxide | |
| Cotunnite | PbCl2 | — | — | 1 | 0 | — | Mineral, Halide | |
| Coulsellite (group) | A2-mMg2F6-wF1-n | Pyrochlore (supergroup) | Fluornatrocoulsellite | 0 | 0 | — | Group | |
| Coulsonite | FeIIVIII2O4 | Spinel (subgroup) | — | 0 | 0 | — | Mineral |
