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Ashcroftine-(Y), K5Na5Y12Si28O70(OH)2(CO3)8·8H2O as fine fibers.
Aegirine, NaFe3+Si2O6 - the dark green crystals
Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
FOV = 3.2 mm
#minerals #mineralogy #mineralcollecting #crystals #Geology
@Micromineral Incredible rare earth silicate! The fibrous habit of Ashcroftine-(Y) is so distinctive - those delicate crystals are a testament to the unique alkaline conditions at Mont Saint-Hilaire. The contrast with the aegirine makes for a beautiful specimen. That quarry continues to produce some of the world's most remarkable REE minerals.