* Metamorphic rocks are formed from existing rocks. They are created when pre-existing igneous, sedimentary, or even other metamorphic rocks are transformed by heat, pressure, and/or chemically active fluids. These conditions cause the original minerals to recrystallize and potentially change their composition.
* Minerals from solution form sedimentary rocks. When minerals precipitate out of a solution (like water), they form sedimentary rocks. Examples include limestone (from calcium carbonate), rock salt (from halite), and chert (from silica).
Here's a breakdown of the differences:
| Process | Rock Type |
|---|---|
| Recrystallization due to heat, pressure, and/or fluids | Metamorphic |
| Mineral precipitation from solution | Sedimentary |
Let me know if you have any more questions about rock formation!
