Crushed Amethyst Powder Natural. Product Description. Grade A Crushed Amethyst from Brazil in Powder Variety. Amethyst is a variety of Quartz and is popular for it’s delicate and regal purple hue’s. how to crush stone into powder . crushed stone into powder crushed stone into powder.Traditionally Bocce Ball courts are covered with a 2 to 3-inch layer of crushed oyster flour spread that has been blended with decomposed granite or crushed stone fines. After that has been done a layer of finely crushed oyster shell flour is often applied. We supply all of these materials for court installations and for seasonal maintenance.