http://sibved.livejournal.com/ ([identity profile] sibved.livejournal.com) wrote in [personal profile] sibved 2016-03-17 11:31 am (UTC)

Посмотрите состав глины в википедии. Кварца в ней менее половины. И в очень мелких частицах. А песок, кварц, оксид кремния - в крупных кристаллах. Гораздо крупнее чем в глине.
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