| A | B |
|---|
| titanium | a durable light weight metal derived from minerals such as ilmentie or rutile |
| hardness | a measure of how easily a mineral can be scratched |
| luster | describes how light is reflected from a mineral's surface |
| cleavage | minerals that break away along smooth flat surfaces |
| fracture | minerals that break with rough or jagged edges |
| streak | the color of the mineral when it is broken up and powdered |
| silicate | minerals that contain silicon and oxygen usually one or more other elements |
| gem | highly prized minerals because they are rare and beautiful |
| magma | hot melted rock material |
| ore | a mineral that contains a useful substance that can be mined at a profit |
| mineral | a naturally occurring, inorganic solid with a definite structure and composition |
| crystal | a solid in which the atoms are arranged in repeating patterns |
