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Thomasclarkite-(Y) is a very rare mineral which was known as UK-93 until 1997, when it was renamed in honour of Dr. Thomas H. Clark (1893-1996), McGill University professor. The mineral is one of many rare earth element minerals from Mont Saint-Hilaire. Rare occurrence in an alkalic pegmatite dike in an intrusive gabbro-nepheline syenite.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Thomasclarkite". A list of authors is available in Wikipedia.|