Question

drag the missing word into place
the of this mineral is conchoidal; its breakage resembles the ripples of a mussel shell.
fracture hardness streak

Explanation:

Conchoidal fracture is a type of fracture in minerals. Hardness refers to a mineral's resistance to scratching, and streak is the color of a mineral's powder when scraped. Since the description is about breakage resembling a mussel shell (which is a characteristic of fracture), the word should be "fracture".

Answer:

fracture