CH 26.1

is a naturally occurring inorganic solid with a crystalline form.

the color of a mineral in powdered form is called streak.

when a mineral breaks along preferred planes of weakness creating sets of smooth parallel sides, it has cleavage.

Minerals that break with irregular surfaces exhibit fracture.

the physical property that measures a mineral’s resistance to scratching is called hardness.

molten rock material inside earth is called magma.