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Horvathite-(Y): NaY(CO3)F2
Comments: Blocky crystals of horvathite-(Y) in matrix. Location: Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry), Mt Saint-Hilaire, Rouville Co., Québec, Canada. Scale: Picture size 3.5 mm. © Thomas Witzke / Abraxas-Verlag