Description: 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).

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