These are actual crystals crushed up or created into sand (nothing else added, just pure semi precious stone tiny shards). 
When gemstones are shaped and polished, tiny shards are made & collected for this sand. 

Gemstone Sand is great for use in jewelry, crafts, creating sand art, orgone generators, resin art projects, or it can be shaped into lines for crystal grids, & more.

Carnelian Sand, 180g jar (Courage)