| A | B |
|---|
| crystal | a solid having a distictive shape because its atoms are arranged in repeating patterns |
| streak | the color of a mineral when it is powdered, usually observed by rubbing the mineral on a ceramic plate |
| magma | molten rock beneath the earth's surface |
| cleavage | the breking of a mineral along smooth, flat surfaces |
| silicate | a mineral containing silicon and oxygen |
| mineral | a naturally occurrung, non-living solid with a definite structure and chemical composition |
| ore | minerals or rocks that contain a useful substance that can be mined at a profit |
| gem | a highly prized mineral because it is rare & beautiful |
| fracture | the physical property of a mineral that causes it to break with rough or jagged edges |
| hardness | a measure of how easily a mineral can be scratched |
| asbestos | a mineral with thread-like flexible fibers used as insulation and in fire protection |
| luster | the physical property of a mineral that describes how light is reflected from its surface |
