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Some rather well-expressed prismatic crystals of orthose, associated with quartz and muscovite, typical paragenesis of the Ménez-Gouaillou pegmatite in Finistère.
8 x 7 x 6 cm.
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Large orthoclase twinned crystals (Carlsbad twin). 10,5 x 5...
Bright amethyst point with slightly more pronounced color on...