Abstract
Fluorellestadite and chlor-fluorellestadite are fluorine and chlorine–fluorine substituted analogues of hydroxylellestadite. They are rare minerals characteristic of calcareous combustion metamorphic rocks. Both fluorellestadite and chlor-fluorellestadite occur in burned coal spoil-heaps in calcinated fragments of petrified wood at its type locality in Kopeisk, as well as in Emanzhelinsk area (both Chelyabinsk coal basin, South Urals, Russia), in the Kizel coal basin, (North Urals, Russia), and in the spoil-heap of Abashevo Mine (Kuznetsk coal basin, Southwest Siberia). Minerals represented by Ca10(SiO4)3–x(SO4)3–x(PO4)2x(OH,F,Cl)2 solid solution. They are associated with typical combustion metamorphic minerals: lime, magnesioferrite, srebrodolskite, harmunite, hematite, periclase, larnite, cuspidine, chlormayenite, fluorapatite, rustumite, and anhydrite. Their detailed mineralogical characterization is presented in the paper.
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