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World Sands Collection
Mĭnjiāng River (No.1), Fújiàn-shěng, China
This sand was transported to the Port of Osaka as building materials.  It is mostly composed of quartz.  There are a lot of grains of feldspar, and a little amounts of shale or siliceous rocks.  The grains are 5mm or less in diameter, well-sorted and rounded.
one scale for 1mm
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