Rock

A Rock is a naturally occurring solid aggregate of minerals, mineraloids, or, in some cases, organic materials.

• Context:
  • It can consist of a single mineral or a combination of several minerals.
  • It can vary in color, texture, and chemical composition.
  • It is used in construction, for decorative purposes, and sometimes for their mineral content.
  • There are three major categories of rocks based on their formation process: Igneous Rock, Sedimentary Rock, and Metamorphic Rock.
• Example(s):
  • Igneous Rocks:
    • Granite - a coarse-grained rock composed mainly of quartz, feldspar, and mica.
    • Basalt - a fine-grained rock composed mainly of plagioclase, pyroxene, and olivine.
    • Peridotite - ...
    • ...
  • Sedimentary Rocks:
    • Limestone - composed mainly of calcite and formed by the accumulation of marine organisms.
    • Sandstone - formed by the accumulation and cementation of sand grains.
    • ...
  • Metamorphic Rocks:
    • Slate - a fine-grained rock derived from clay or shale and used for roofing and flooring.
    • Marble - a rock derived from limestone or dolostone and used in sculpture and architecture.
    • ...
• Counter-Example(s):
  • Synthetic Substance, such as: plastics.
  • Liquid Aggregate, such as magma.
• See: Mineral, Geology, Gemstone, Fossil.

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