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  2. Limescale - Wikipedia

    en.wikipedia.org/wiki/Limescale

    Limescale is a hard, chalky deposit, consisting mainly of calcium carbonate (CaCO 3). It often builds up inside kettles, boilers, and pipework, especially that for hot water. It is also often found as a similar deposit on the inner surfaces of old pipes and other surfaces where hard water has flowed.

  3. Hydrothermal mineral deposit - Wikipedia

    en.wikipedia.org/wiki/Hydrothermal_mineral_deposit

    Skarn Mineral Deposits tend to be small in size but high in mineral grade. Therefore, it is a balance and challenge to find a profitable skarn orebody. Geologically speaking, a skarn deposit is an assemblage of ore and calc-silicate minerals, formed by metasomatic replacement of carbonate rocks in the contact aureole of a pluton.

  4. Hard water - Wikipedia

    en.wikipedia.org/wiki/Hard_water

    A bathtub faucet with built-up calcification from hard water in Southern Arizona. Hard water is water that has a high mineral content (in contrast with "soft water"). Hard water is formed when water percolates through deposits of limestone, chalk or gypsum, [1] which are largely made up of calcium and magnesium carbonates, bicarbonates and sulfates.

  5. Hydrothermal circulation - Wikipedia

    en.wikipedia.org/wiki/Hydrothermal_circulation

    Hydraulic head from mountain ranges, for example, the Great Artesian Basin; Dewatering of metamorphic rocks, which liberates water; Dewatering of deeply buried sediments; Hydrothermal circulation, in particular in the deep crust, is a primary cause of mineral deposit formation and a cornerstone of most theories on ore genesis.

  6. Ore genesis - Wikipedia

    en.wikipedia.org/wiki/Ore_genesis

    Epithermal — mineral ore deposits formed at low temperatures (50–200 °C) near the Earth's surface (<1500 m), that fill veins, breccias, and stockworks. [2] Telethermal — mineral ore deposits formed at shallow depth and relatively low temperatures, with little or no wall-rock alteration, presumably far from the source of hydrothermal ...

  7. Greisen - Wikipedia

    en.wikipedia.org/wiki/Greisen

    Greisen fluids are formed by granites as the last highly gas- and water-rich phases of complete crystallisation of granite melts. This fluid is forced through the interstitial spaces of the granite into veins and pools at the upper margins, where boiling and rock alteration occur.

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  9. Hydrothermal vent - Wikipedia

    en.wikipedia.org/wiki/Hydrothermal_vent

    This water is rich in dissolved minerals from the crust, most notably sulfides. When it comes in contact with cold ocean water, many minerals precipitate, forming a black, chimney-like structure around each vent. The deposited metal sulfides can become massive sulfide ore deposits in time.