hard, and sometimes brittle, natural or artificial substances used for grinding, polishing, or scouring. Also called abrasive matter. Varieties of abrasive materials are (a) Carbonado: which consist of microcrystalline diamond and amorphous carbon. (b) Hailstone borate: which contains alternate sheets of diamond and other substance. (c) Framsite: which is more granular than carbonado and contains less diamond. (d) Stewartite: similar to carbonado but also contains some magnetite. (e) Ballas: microcrystalline diamond, usually free of inclusions. Also termed shot boart. Found in diamond mine areas. Abrasive, ballas.
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© 2009 Springer-Verlag Berlin Heidelberg New York
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(2009). abrasive material. In: Manutchehr-Danai, M. (eds) Dictionary of Gems and Gemology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-72816-0_54
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