Finding and Identifying Silica Sand for Carnivorous Plant Mixes

Ken can't find pure silica sand locally. Detailed guide: identify by translucence under 10x loupe (quartz grains); avoid river/beach sand (mixed rock types). Natural silica sand: frosted, color variation, rounded. Artificial: clear, uniform, sharp edges. Both acceptable. Sources: sandblasting suppliers, auto body shops, glass/stained glass/sign businesses, masonry suppliers (verify), pool filter sand, reptile sand (expensive). Call local sandblasting businesses, university art departments, glass craftsmen.