| A | B |
|---|
| mineral | naturally occurring inorganic solid with a definite chemical composition and an orderly arrangement of atoms |
| crystal | a solid in which the atoms are arranged in orderly, repeating patterns |
| magma | hot, melted rock material, called magma |
| silicates | minerals that contain silicon and oxygen and usually one or more other element |
| hardness | measure of how easily a mineral can be scratched |
| luster | describes the way a mineral reflects light from its surface; can be metallic or nonmetallic |
| specific gravity | ratio of mineral's weight compared with the weight of an equal volume of water |
| streak | color of a mineral when it is in powdered form |
| cleavage | physical property of some minerals that causes them to break along smooth, flat surfaces |
| fracture | physical property of some minerals that causes them to break with uneven, rough, or jagged surfaces |
| gems | beautiful, rare, highly prized mineral that can be worn in jewelry |
| ore | liquid fossil fuel formed from marine organisms that is burned to obtain energy and used in the manufactoring of plastics |
