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Igneous Rocks
Minerals and Rockas Part 2
Term | Definition |
---|---|
Igneous Rocks | Rock type that form when molten material solidifies |
Environment of Formation | The location where liquid rock solidifies into solid rock |
Magma | Molten rock that is inside the earth |
Plutonic | Rock that formed deep within the earth |
Intrusive | Below earths crust |
Lava | Molten rock that is outside of the earth |
Volcanic | Rock that formed on the earths surface |
Extrusive | Above earths crust |
Color | For igneous rocks color is broken down into two categories of light and dark |
Composition | A mixture that make up an igneous rock |
Felsic | Light colored rocks that have a high aluminum (Al) content an silicon (Al) |
Mafic | Dark colored rocks that have a high iron (Fe) or magnesium (Mg) content |
Texture | The appearance or characteristic of a rock |
Vescular | Texture that consists of gas pockets that give the appearance of having holes |
Prophyritic | Texture that contains large crystals in a fine grained mixture |
Crystal Size | Refers to an actual measurement of the individual crystals or aggregate |
Course or very | The longer the cooling time the longer the crystal size |
Glassy or fine | The shorter the cooling time the smaller the crystal size |