Minerals & Rocks
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Chert
Read more: ChertChert is a fine-grained sedimentary rock that belongs to the chemical and biochemical subclass. It is characterized by its microcrystalline texture, hardness, and conchoidal fracture, …
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Travertine
Read more: TravertineTravertine is a sedimentary rock and a sub-class of limestone formed primarily by the precipitation of calcium carbonate minerals in hot springs, caves, or other …
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Magnesite
Read more: MagnesiteMagnesite is a carbonate mineral that belongs to the calcite group. It is composed primarily of magnesium carbonate (MgCO3) and is known for its distinctive, …
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Onyx
Read more: OnyxOnyx is a banded variety of chalcedony, a cryptocrystalline form of silica belonging to the quartz family. It is known for its striking parallel bands …
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Sandstone
Read more: SandstoneSandstone is a clastic sedimentary rock primarily composed of sand-sized mineral particles or rock fragments. These grains are typically cemented together by minerals such as …
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Shale
Read more: ShaleShale is a fine-grained sedimentary rock that belongs to the clastic category. It forms from the compaction of silt and clay-sized mineral particles, resulting in …
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Breccia
Read more: BrecciaBreccia is a clastic sedimentary rock composed of angular rock fragments cemented together within a finer-grained matrix. These rock fragments can vary in size, composition, …
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Basalt
Read more: BasaltBasalt is an extrusive igneous rock primarily composed of plagioclase feldspar, pyroxene, and sometimes olivine. It is characterized by a fine-grained or aphanitic texture and …
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Obsidian
Read more: ObsidianObsidian is an extrusive igneous rock characterized by its glass-like appearance and lack of a crystalline structure. This unique rock is typically black or dark …
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Scoria
Read more: ScoriaScoria is an extrusive igneous rock characterized by its vesicular or porous texture, which results from the release of volcanic gases during the rock’s formation. …
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