Tashelgite
Tashelgite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula CaMgFe²⁺Al₉O₁₆(OH).
It crystallizes in the monoclinic crystal system (space group Pc).
Key properties: Mohs hardness 7.5; specific gravity 3.67; Vitreous luster; optically biaxial.
IMA symbol Thg, IMA status: approved, named in 2010.
Found in skarn-like rocks anomalously enriched with Al2O3.
It is found associated with Calcite, hibonite, grossular, vesuvianite, hercynite, magnetite, corundum, perovskite, scapolite, diopside, apatite.
The name refers to the Taghelga River valley, in which the species was first collected.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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