Any sand used for abrasive and grinding purposes, but the term does not include the sharp grains obtained by crushing quartz and used for sandpaper. The chief types of abrasive sand include sandblast sand, glass-grinding sand, and stone-cutting sand. Sand for stone sawing and for marble and glass grinding is usually ungraded, with no preparation other than screening, but it must have tough, uniform grains. Chats are sand tailings from the Missouri lead ores, used for sawing stone. Banding sand is used for the band grinding of tool handles and for the grinding of plate glass, but is often replaced by artificial abrasives. Banding-sand grains are fine, 95% being retained on a 150-mesh screen. Burnishing sand, for metal polishing, is a fine-grain silica sand with rounded grains. It should pass a 65-mesh screen, and be retained on a 100-mesh screen.
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