Space group P2 | Crystal system Monoclinic Formula mass 375.77 g/mol | |
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Formula(repeating unit) (Na, Ce)(Y, REE)(HCO3)(OH)3·4(H2O) Crystal class Sphenoidal (2)(same H-M symbol) | ||
Thomasclarkite-(Y) is a rare mineral which was known as UK-93 until 1997, when it was renamed in honour of Thomas H. Clark (1893–1996), McGill University professor. The mineral is one of many rare earth element minerals from Mont Saint-Hilaire. The only reported occurrence is in an alkalic pegmatite dike in an intrusive gabbro-nepheline syenite.
References
Thomasclarkite-(Y) Wikipedia(Text) CC BY-SA