# Is sand a mixture or a compound?

I was given an assignment to find out if sand is a mixture or a compound I'm sure it can't be an element. Considering the fact that a mixture contains two or more substances that are not chemically combined and not proportionally fixed and a compound is contained substances that are chemical combined and are fixed proportionally. Sand contains a lot of divided small rocks and mineral particles.

• Indeed you are correct. It is not an element. Now tell us about your thoughts on whether it is a mixture or a compound. Perhaps you could start by telling us your definition of mixtures and compounds and how this applies to sand. – bon Feb 6 '16 at 15:32
• Filter through this. – bonCodigo Nov 19 '17 at 3:49

The main component of sand is $\ce{SiO2}$, silicon dioxide. If you purified the sand, you could obtain a pure compound, but in general, natural deposits of sand have $\ce{SiO2}$ and a lot of other "stuff" (e.g. organic molecules, iron oxides, and even biological matter), which is called a mixture.