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Fairchildite: K2Ca(CO3)2
Comments: PPL thin-section image of fused wood-ash stone, showing slightly altered lath-shaped cross-sections of fairchildite in a fine groundmass containing buetschliite and calcite. Inset image shows sample. Location: Kaniksu National Forest, Idaho. (AmMin, v32:607). Scale: Thin Section 30 X. © American Mineralogist