| A | B |
|---|
| Gems | Beautiful, rare, and highly prized mineral that can be worn in jewlery. |
| Magma | Hot, melted rock material beneath Earth's surface. |
| Hardness | How easily a mineral can be sratched. |
| Fracture | Physical property of some minerals that causes them to break with with uneven, rough, or jagged surfaces. |
| Cleavage | Physical property of some minerals that causes them to break along smooth, flat surfaces, p. 71 |
| Silicate | Describes a mineral that contains silicon and oxygen and usually one or more other elements. p. 66 |
| Minerals | Naturally occuring inorganic solid with definite chemical composition and orderly arrangement of atoms. |
| Specific Gravity | Ratio of its weight, compared to weight of an equal volume of water. |
| Crystal | Solid in which atoms are arranged orderly, repeating pattern p. 63 |
| Ore | Useful substance that can be mined at a profit. |
| Luster | Describes the way a mineral reflects light from its surface; can be metallic or nonmetallic p. 70 |
| Streak | Color of a mineral when it is in powder form. |
