Piergorite-(Ce)
Piergorite-(Ce) is an IMA-recognized mineral species in the silicate class, with the chemical formula Ca₈Ce₂AlLiSi₆B₈O₃₆(OH)₂.
It crystallizes in the monoclinic crystal system (space group P2/a).
Key properties: Mohs hardness 5.5–6; specific gravity 3.67; Vitreous luster; optically biaxial.
IMA symbol Pgo-Ce, IMA status: approved, named in 2005.
Found in miarolitic cavities in syenitic volcanic ejectum.
It is found associated with Sanidine, mica, magnetite, rutile, titanite, other Th-U-REE bearing minerals.
An acronym from the names of two Italian collectors, Giancarlo Pierini and Pietro Gorini, who provided the material studied. A suffix indicates the dominant rare earth element.
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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