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List of SPA endmembers derived from the Cuprite data and corresponding PPI endmember when applicable
| SPA endmember | PPI-endmember (“truth”) |
|---|---|
| SPA_1, SPA-17 | Silicate (bright) |
| SPA_16 | Silica (dark) |
| SPA_4 | Alunite 1 (2.16 μm) |
| SPA_12, SPA_15 | Alunite 2(2.18 μm) |
| SPA_8 | Buddingtonite |
| SPA_3, SPA_14 | Kaolinite |
| SPA_6 | Calcite |
| SPA_5 | Zeolite |
| SPA_7, SPA_10, SPA_11, SPA_13 | Muscovite/illite |
| *SPA_9 | Na |
| **SPA_2, SPA_18, SPA_19 | Na |
Thisendmember is a rock/mineral.
These endmembers are for shade/shadow.
