Which is characteristic of a mineral?
A.
It must be man-made and crystalline.
B.
It must be naturally occurring and crystalline.
C.
It must be man-made and amorphous.
D.
It must be naturally occurring and amorphous.
A.
It must be man-made and crystalline.
B.
It must be naturally occurring and crystalline.
C.
It must be man-made and amorphous.
D.
It must be naturally occurring and amorphous.