diamond grinding stone sand making stone quarry,
Full text of "Abrasives & abrasive wheels, their nature, manufacture .
The diamond is, of course, a natural abrasive; indeed it is the hardest of all, but . The Gray Canyon quarry at Amherst, Ohio, is classed as the largest quarry in the world. Sand- stones are of various colors, these being derived from impurities that . grinding done in the early manufacturing days consisted of tool sharpening.