The first archaeological evidence of natural abrasives dates to about 20,000 BC, when various peoples used sand and stone to shape weapons and tools. Ancient Egyptians and Romans used emery, a fine-grained mineral, to polish gems, marble, and metals. Other natural substances used as abrasives include corundum, diamonds, garnet, pumice, talc, quartz, sandstone, and certain vegetable fibers. The first abrasive sheets were made by gluing sand to a paper backing.
Many natural abrasives are mined in large amounts. These include sand, which is granulated quartz, and pumice, hardened lava foam used in scouring powders and metal polish. Supplies of other natural abrasives such as diamonds and other precious gems are much more limited.
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