Common Minerals:
* Quartz (SiO2): Very resistant to weathering, making it a common constituent of sand and sandstone.
* Feldspar (various compositions): Less resistant than quartz, it breaks down into clay minerals during weathering.
* Clay Minerals (various compositions): Formed by the alteration of feldspar and other minerals; common in mudstones, shales, and clays.
* Calcite (CaCO3): The main mineral in limestone, formed from the accumulation of marine organisms' shells and skeletons.
* Dolomite (CaMg(CO3)2): Found in dolomite rock, often formed through the alteration of limestone.
* Gypsum (CaSO4·2H2O): Found in evaporite deposits, forming rocks like gypsum and anhydrite.
* Halite (NaCl): Common in evaporite deposits, forming rock salt.
Less Common Minerals:
* Iron Oxides (e.g., hematite, goethite): Contribute to the red color of some sedimentary rocks.
* Carbonates (e.g., siderite, magnesite): Can be found in some sedimentary rocks, often associated with iron or magnesium.
* Sulphates (e.g., barite): Less common but can be found in some sedimentary deposits.
Organic Matter:
* Coal: Formed from the accumulation and compaction of plant material.
* Oil and Gas: Formed from the decomposition of organic matter in sedimentary rocks.
It's important to note that the specific mineral composition of a sedimentary rock can vary greatly depending on its origin, the environment in which it formed, and the subsequent diagenetic processes (changes after deposition).
For example, a sandstone formed from quartz-rich granite will be dominated by quartz, while a limestone formed from marine organisms will be mostly calcite.
