How are minerals formed in igneous and metamorphic rocks?
Answer:
1. Formation in Igneous Rocks:
- Cooling and Solidification: When magma or lava cools, minerals crystallize and form within the rocks.
- Large vs. Small Crystals: Slow cooling (deep underground) forms large crystals, while rapid cooling (on the surface) forms small crystals.
- Examples: Granite contains minerals like quartz, feldspar, and mica, while basalt has pyroxene and olivine.
2. Formation in Metamorphic Rocks:
- Heat and Pressure: Minerals change under intense heat and pressure inside the Earth.
- Recrystallization: Existing minerals rearrange into new forms without melting.
- Examples: Limestone changes into marble, and shale transforms into slate.
⛏️ Igneous rocks form minerals from magma, while metamorphic rocks transform existing minerals under pressure! 🔥🌍