1. Weathering (Breakdown of Rocks)
* Carbonation: Calcium carbonate (limestone) + Carbon dioxide + Water → Calcium bicarbonate (dissolved in water)
* Hydrolysis: Feldspar + Water → Clay minerals + Dissolved ions
* Oxidation: Iron minerals (e.g., pyroxene) + Oxygen → Iron oxides (rust)
* Acid Rain: Limestone + Sulfuric acid → Calcium sulfate + Water + Carbon dioxide
2. Metamorphism (Changes Due to Heat and Pressure)
* Recrystallization: Limestone (calcium carbonate) + Heat and Pressure → Marble (calcium carbonate with larger crystals)
* Dehydration: Clay minerals + Heat and Pressure → Mica + Water
* Chemical Reactions: Dolomite (calcium magnesium carbonate) + Heat and Pressure → Calcite (calcium carbonate) + Magnesium silicate
3. Igneous Rock Formation (Cooling and Solidification of Magma/Lava)
* Magma Crystallization: Silicate minerals (in magma) + Cooling → Igneous minerals (in solid rock)
* Volcanic Gas Release: Dissolved gases (in magma) + Cooling → Volcanic gases (released into the atmosphere)
4. Sedimentation (Formation of Sedimentary Rocks)
* Mineral Precipitation: Dissolved minerals (in water) + Evaporation/Cooling → Mineral crystals (precipitate out)
* Biogenic Processes: Calcium carbonate (in shells) + Pressure and time → Limestone
* Cementation: Sand grains + Dissolved minerals (in water) → Sandstone (with mineral cement)
Important Notes:
* Chemical Formulas: These equations are simplified word equations. For a complete understanding of the chemical reactions, you would need the actual chemical formulas.
* Multiple Reactions: Rock formation and transformation involve complex chains of reactions, not just single steps as shown here.
* Conditions Matter: The specific reactions and products vary greatly depending on the type of rock, environmental conditions (temperature, pressure, water content), and the presence of other chemicals.
Let me know if you have any other questions about rock chemistry!
