ore genesis Process by which a mineral deposit forms. Metalliferous mineral deposits may be syngenetic (formed at the same time as the host rocks) or epigenetic (deposited later than the host rocks). Deposits may be classified according to their processes of formation into igneous, sedimentary, metamorphic (see METAMORPHISM), or hydrothermal.
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Sill , Sill A sill is a formation of igneous rock found in features such as mesas, hogbacks, and cuestas. Although sills can become exposed, sills are forme… Geode , Geode Geodes are hollow rock masses that are lined with crystals that have grown toward the center of the cavity. Geodes are usually roughly spherica… Dike , Dike A dike is a formation of igneous rock that can form exposed vertical or linear ridges. Dikes are formed underground and are an intrusive plutoni… Host , host The host is the consecrated bread of the Eucharist; its Latin root, ‘hostia’, meaning a sacrificial victim, suggests a theological understanding… Igneous Rocks , Igneous rocks are formed by the cooling and hardening of molten magma. The word igneous comes from the Latin word igneus, meaning fire, and there are… Iron Ores , Rocks Rocks are composed of minerals, which are natural inorganic (nonliving) substances with specific chemical compositions and structures. A rock m…
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