| A | B |
|---|
| mineral | a naturally occurring, inorganic solid, with a definite structure and composition |
| crystal | a solid in which the atoms are arranged in repeating patterns |
| magma | hot melted rock material |
| silicates | minerals that contain silicon and oxygen and usually one or more other elements |
| hardness | a measure of how easily a mineral can be scratched |
| luster | how light is reflected from a mineral's surface |
| streak | the color of a mineral when it is broken up and powdered |
| cleavage | minerals that break along smooth flat surfaces |
| fracture | minerals that break with rough or jagged edges |
| gems | rare or beautiful minerals that are highly priced |
| ore | a mineral that contains a useful substance that can be mined for a profit |
| asbestos | a mineral with threadlike, flexible fibers; use in insulation; found to cause cancer |
