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Rocks and Minerals
4th Grade
Term | Definition |
---|---|
Rock | Earth material made of multiple minerals. |
Minerals | Earth material that cannot be broken down into different components |
Hardness | Resistance of being scratched. Tested with a scratch test |
Color | Mineral property. Least useful when identifying. |
Streak | Color left behind when mineral is scratched against a streak plate |
Luster | Shininess of a mineral. How light reflects off of the mineral |
Cleavage | How a mineral breaks. If smooth it is cleavage. If jagged it is fracture. |
Metamorphic rock | Formed when a rock is transformed due to heat and pressure. |
Igneous Rock | Formed from cooling magma. Often has holes or vesicles in the rock. |
Sedimentary rock | Formed from particles such as pebbles, sand, silt, or clay. May contain fossils |
Vinegar test | Tests to see if calcite is present in a rock. |