FMF Minerals Gallery

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Gadolinite
Isle of Arran, Scotland, UK
3mm crystal
A rare associate mineral, found only in one cavity in the granite; the same cavity as the large smoky in this post. The mineral has been tested. The matrix is composed of tiny feldspar and quartz crystals, and a few smaller gadolinite crystals. Self-collected (though when first spotted I thought it was sphene/titanite). (Author: Mike Wood)