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Rock vs. Mineral
| Term | Definition |
|---|---|
| crystalline | having a repeating, ordered, inside structure |
| minerals | naturally occurring, non-living solids that have a crystalline structure |
| color | the color or range of colors that a mineral usually appears to be |
| luster | the way in which the surface of a mineral reflects light |
| streak | the mark left behind after rubbing a mineral on a hard, rough, white surface |
| cleavage | the way some minerals break along flat planes to form regular shapes |
| fracture | the way minerals can break into random pieces with no regular shape |
| hardness | describes how easily a mineral can be scratched |