Osumilite-(Mg)
Osumilite-(Mg) is an IMA-recognized mineral species in the silicate class, with the chemical formula KMg₂Al₃(Al₂Si₁₀)O₃₀.
It crystallizes in the hexagonal crystal system (space group P6/mcc). It is a member of the Milarite structural group.
Key properties: specific gravity 2.58–2.68; Pearly luster; optically uniaxial.
IMA symbol Osm-Mg, IMA status: approved, named in 2011.
Found in fused xenoliths and contact metamorphic rocks.
It is found associated with Cordierite, sodic plagioclase, sanidine, \hypersthene, " tridymite, quartz, biotite, zircon, magnetite, hematite, graphite.
The name refers to the relation to osumilite and predominance of magnesium.
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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