ext_174465: (Default)
perspicuity ([identity profile] perspicuity.livejournal.com) wrote in [personal profile] urbpan 2006-08-13 03:03 pm (UTC)

and as it picks up a lot of minerals (silica?) it's been used as a scouring pad and sanpaper material in times long gone by :)

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(20 comments)

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