it does so also with the growth planes too. they grow in platelets. topaz has one plane, sapphire 3 planes so has quartz. then add flaws, stresses, and micro rods of rutile, bingo prob’s. we just use a TIN lap at very slow speed and 50k diamond powder and just enough water to keep a muddy slur. then hope for best. i ended up making my own TIN lap to get the best i can polish. and have a few out there with very happy campers polishing.