Atelisite-(Y)
Atelisite-(Y) is an IMA-recognized mineral species in the silicate class, with the chemical formula Y₄Si₃O₈(OH)₈.
It crystallizes in the tetragonal crystal system (space group I-42d). It is a member of the Zircon structural group.
Key properties: specific gravity 4.26; Colorless streak; Vitreous luster; optically uniaxial.
IMA symbol Ael-Y, IMA status: approved, named in 2010.
A late, hydrothermal mineral in dissolution cavities in fluorite in niobium-yttrium- fluorine (NYF) type, quartz-microcline pegmatite.
It is found associated with Xenotime-(Y), calcioancylite-(Nd), La-dominant calcioancylite.
Its name comes from Greek “atels”, meaning deficient, in allusion to the Si-deficiency of the mineral.
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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