Question

1. which property causes the mineral galena to break into tiny cubes? a. density b. crystal structure c. hardness d. luster

Explanation:

The crystal structure of a mineral determines its cleavage patterns. Galena has a cubic crystal - structure which causes it to break into tiny cubes along planes of weakness. Density is mass per unit volume, hardness is resistance to scratching, and luster is the way a mineral reflects light, none of which cause the cubic - shaped breakage.

Answer:

B. crystal structure