| A | B |
|---|
| crystalline structure | a structure in which particles are arranged in regular geometric patterns |
| mineral | a naturally occuring, inorganic solid with a specific chemical composition and a definite crystalline structure |
| crystal | a solid in which the atoms are arranged in repeating patterns |
| luster | the way that a mineral reflects light from its surface |
| hardness | a measure of how easily a mineral can be scratched |
| cleavage | how a mineral splits along planes of weakness |
| fracture | a break with a rough or jagged edge |
| streak | the color of a mineral when it is broken or powdered |
| specific gravity | ratio of the mass of a substance to the mass of an equal volume of water at 4 degrees Celsius |
| restricted | small space; to have limits |
| element | a substance that cannot be broken down into simpler substances by physical or chemical means |
| silicates | minerals that contains silicon and oxygen, and usually one additional element |
| tetrahedron | a three-dimensioinal shape that resembles a pyramid |
| ore | a mineral that contains a useful substance that can be mined at a profit |
| gem | a valuable mineral prized for its rarity and beauty |
