Essential Mineralogy and Rock Formation Processes

Minerals: These are defined by their solid state, fixed chemical composition, origin through natural processes, and crystalline structure.

Formation of Minerals

• Chemical precipitation: Occurs through the precipitation of salts in the water.
• Solidification: Occurs when magma cools.
• Sublimation: Minerals crystallized from volcanic gases.

Mineral Properties

Key properties include density, hardness, cleavage, color, brightness, and clearness.

Endogenous Rocks

Endogenous rocks originate in endogenous geological processes, which are driven by the internal energy of the planet.

Metamorphic Rocks

Metamorphic rocks are formed by metamorphism, which is a transformation of minerals in a rock that already exists due to changes in pressure and temperature.

Magmatic Rocks

Magmatic rocks come from magmas.

Exogenous Rocks

Exogenous rocks originate in exogenous geological processes that develop on the Earth's surface as a result of the action of the atmosphere, hydrosphere, or living things.

The Process of Diagenesis

Diagenesis is a set of processes that transform sediments into sedimentary rocks in the deeper layers that are subject to higher pressures and temperatures.

• Compaction: Reduction of the volume produced by pressure from the weight of the sediment layers, eliminating sediment voids and expelling these fluids.
• Cementing: Precipitation of natural cements; these cements are dissolved in water circulating through the holes of the sediments.

Rock Dynamics

• Gliptogenesis: Exogenous geological processes due to the action of surface geological agents that alter and erode the rocks and lead to the destruction of relief.
• Lithogenesis: Processes that form the different types of rocks.
• Orogenesis: Endogenous geological processes forming mountain ridges.

Terrestrial Relief

The terrestrial relief changes and is the result of the interaction of a set of processes (endogenous and exogenous). The internal energy of the planet has been contained inside the Earth since the time of its formation.

Solar Energy and Weathering

Solar energy, coupled with gravity, affects the dynamics of the atmosphere and hydrosphere processes and leads to exogenous geological processes.

Weathering (Meteorization)

Weathering is the process of alteration or decomposition of rocks by the joint action of water, the atmosphere, and living beings on the surface.

• Physics: This refers to the disintegration of the surface rocks.