| A | B |
|---|
| mineral | a naturally occuring, inorganic solid with a definite structure and composition |
| crystal | a solid in which the atoms are arranged in repeatinig patterns |
| magma | hot, melted rock |
| silicate | 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 | color of the mineral when it is broken up and powdered |
| cleavage | when minerals break along smooth, flat surfaces |
| fracture | when minerals break with rough or jagged edges |
| gem | highly prized minerals because they are rare and beautiful |
| ore | a mineral that contains a useful substance that can be mined for a profit |
| titanium | a durable, lightweight metal derived from minerals such as ilmenite or rutile |
