Which is characteristic of a mineral?

A.
It must be crystalline and have an indefinite chemical composition.

B.
It must be amorphous and have an indefinite chemical composition.

C.
It must be amorphous and have a definite chemical composition.

D.
It must be crystalline and have a definite chemical composition.

Question

Which is characteristic of a mineral? 	
	
 
A.
	It must be crystalline and have an indefinite chemical composition.
	
 
B.
	It must be amorphous and have an indefinite chemical composition.
	
 
C.
	It must be amorphous and have a definite chemical composition.
	
 
D.
	It must be crystalline and have a definite chemical composition.

anonymous · Answer

It must be crystalline and have a definite chemical composition :D

anonymous · Answer

Yep, D. A rock is a conglomerate of multiple minerals.  Minerals must have a definite chemical formula that can describe the entire sample.  Rocks require multiple different chemical formulas to describe the different minerals in it.