Yep, silica. If you're asking, you probably remember learning that silica most often appears in nature as sand. Like iron and magnesium, silica is one of the minerals our bodies use to stay healthy, even though it seems a little strange to think of eating it.

What does sea salt contain?

Sea salt is made by evaporating seawater. Like table salt, it is mostly just sodium chloride. However, depending on its source and how it was processed, it usually contains various trace minerals like potassium, iron and zinc. The darker the sea salt, the higher its concentration of impurities and trace nutrients.

Are salt and sand related?

Components of any mixture, such as sand and salt, are separated based on their differences. Both sand and salt are solids with similar-size particles. However, the particles look different under magnification. One method to separate sand and salt is to use tweezers to mechanically separate the grains, piece by piece.