Ominelite
Ominelite is an IMA-recognized mineral species in the silicate class, with the chemical formula Fe²⁺Al₃O₂(BO₃)(SiO₄).
It crystallizes in the orthorhombic crystal system (space group Pbnm).
Key properties: Mohs hardness 7; specific gravity 3.169; Pale blue streak; Vitreous luster; optically biaxial.
IMA symbol Omi, IMA status: approved, named in 1999.
Found in porphyritic granite and granodiorite (Japan); in borosilicate-bearing veinlets cutting leucogranulite (Czech Republic).
It is found associated with Sekaninaite, garnet, biotite, andalusite, topaz, alkali feldspar, plagioclase, muscovite, quartz, dumortierite, schorl, zircon, ilmenite, apatite, monazite.
The name refers to the Omine Mountains, Japan, where the first specimens were 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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