Percleveite-(La)
Percleveite-(La) is an IMA-recognized mineral species in the silicate class, with the chemical formula La₂Si₂O₇.
It crystallizes in the tetragonal crystal system (space group P4_1). It is a member of the Percleveite structural group.
Key properties: Mohs hardness 6; specific gravity 5.094; White streak; Greasy luster; optically uniaxial.
IMA symbol Pcv-La, IMA status: approved, named in 2019.
Found in polymineralic REE-bearing nodules.
It is found associated with Allanite-(Ce), allanite-(La), bastnäsite-(Ce), bastnäsite-(La), ferriallanite-(Ce), ferriallanite-(La), ferriperbøeite-(Ce), ferriperbøeite-(La).
The suffix identifies the La-dominant analogue of percleveite-(Ce).
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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