Question

Of all the minerals known to man, how many are common on the crust of the earth?

Answer 1

All of them.

Explanation:

There are up to 4714 mineral species according to some sources.
http://www.webmineral.com/Alphabetical_Listing.shtml#.Wn-zZnBx2sI

https://geology.com/minerals/

They are all in the earth's crust. If you mean to ask which are the most common in the crust, see these references:
http://www.sandatlas.org/composition-of-the-earths-crust/

http://www.rsc.org/Education/Teachers/Resources/jesei/minerals/students.htm