Which statement is true for all minerals?

A.
They have a crystalline structure.

B.
They contain useful metals.

C.
They are made of silicon and oxygen.

D.
They are too hard to be scratched with a nail.

Question

Which statement is true for all minerals?	
 
 A.
They have a crystalline structure.
 
 B.
They contain useful metals.
 
 C.
They are made of silicon and oxygen.
 
 D.
They are too hard to be scratched with a nail.

anonymous · Answer

A mineral:

    Is naturally occurring
    Is a solid
    Is inorganic (mostly)
    Has a fixed chemical formula
    Has an orderly crystalline structure

Therefore "A" is your correct answer