Oftedalite
Oftedalite is an IMA-recognized mineral species in the silicate class, with the chemical formula KSc₂ ₂Be₃Si₁₂O₃₀.
It crystallizes in the hexagonal crystal system (space group P6/mcc). It is a member of the Milarite structural group.
Key properties: Mohs hardness 6; specific gravity 2.61; Colorless streak; Vitreous luster; optically uniaxial.
IMA symbol Oft, IMA status: approved, named in 2003.
Found in a complex granitic pegmatite.
It is found associated with Sc-rich milarite, tourmaline, yttrian milarite, bazzite, thortveitite, kristiansenite, bertrandite.
The mineral was named to honor Ivar Oftedal (1894-1976), former Professor of Mineralogy, Institute of Geology, University of Oslo.
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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