About how many minerals make up most types of rock?

20 different kinds of minerals make up 95% of earth's rocks.

I hope this helps... please correct me if i'm wrong

20 different minerals or 95% of minerals make up rocks.

Explanation:

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.