| A | B |
|---|
| Mohs' scale of hardness | a scale used to help to identify minerals |
| Mohs' hardness bet. 1 & 2 | can be scratched by a fingernail |
| Mohs' hardness between 3 & 4 | it can be scratched by a coin but not a fingernail |
| Mohs' hardness between 5 & 6 | can be scratched by a steel nail but not a coin |
| Mohs' hardness between 7 & 10 | scratched only by a diamond |
| 5 properties used to identify rocks and minerals | appearance, texture, cleavage, hardness, streak |
| nail | use this to determine the hardness of a mineral |
| texture | use your eyes and fingers to observe this property |
| easier | more properties you know about a rock, identifying it gets ____ |
| physical properties of rocks | hardness, color, texture, streak |
| harder than streak plate | sample rock leaves no streak |
| touch and sight | two senses used to determine the properties of a rock/mineral |
| some rocks will react | when hydrochloric acid is dropped on rocks |
| soft rock or mineral | leave a larger streak than a hard one |
| color of streak | not the same as the color of rock/mineral being tested |
| different colors | each rock/mineral's streak |
| smooth and greasy | texture |
