stones are often prized for their natural beauty as stones and their rarity, adding value as collector's items. Furthermore, each natural stone is different, and there are rare natural stones that contain abrasive particles with different properties than are currently available in artificial stones. Two common stones in the UK are the Water of Ayr stone and the speckled Tam'o Shanter stone, both forms of slate used as razor oilstones.

Artificial (synthetic) stones

Artificial stones usually come in the form of a bonded abrasive

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