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Dust again!  One of the amazingly varied forms that a single speck of dust can take - they turn from specks to angular mountains, billowing sails, or fluffy clouds.  This one’s darker, smoother, and sharper than most… my guess would be that it’s maybe a microscopic shard of glass.  At 10 microns wide, it’s larger than most of the dust I’ve encountered - though 10 microns is only 0.01mm, so it’s still definitely microscopic.