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  • curprev 20:07, 23 January 2019‎ Molyneux talk contribs‎ 514 bytes +514‎ Triassic Sherwood Sandstone Group, County Antrim, Northern Ireland, U.K., a polycrystalline quartz grain of metamorphic origin. The grain has sutured internal boundaries between composite crystals and a preferential alignment of the constituent crystal...
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