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  2. Aragonite - Wikipedia

    en.wikipedia.org/wiki/Aragonite

    Aragonite is a carbonate mineral and one of the three most common naturally occurring crystal forms of calcium carbonate ( Ca CO 3 ), the others being calcite and vaterite. It is formed by biological and physical processes, including precipitation from marine and freshwater environments. Aragonite crystal structure.

  3. Olivine - Wikipedia

    en.wikipedia.org/wiki/Olivine

    Olivine. The mineral olivine ( / ˈɒl.ɪˌviːn /) is a magnesium iron silicate with the chemical formula ( Mg, Fe)2 Si O 4. It is a type of nesosilicate or orthosilicate. The primary component of the Earth's upper mantle, [9] it is a common mineral in Earth's subsurface, but weathers quickly on the surface.

  4. Mineral - Wikipedia

    en.wikipedia.org/wiki/Mineral

    Mineral. Crystals of serandite, natrolite, analcime, and aegirine from Mont Saint-Hilaire, Quebec, Canada. In geology and mineralogy, a mineral or mineral species is, broadly speaking, a solid substance with a fairly well-defined chemical composition and a specific crystal structure that occurs naturally in pure form.

  5. Sunstone - Wikipedia

    en.wikipedia.org/wiki/Sunstone

    Sunstone. Sunstone is a microcline or oligoclase feldspar, which when viewed from certain directions exhibits a spangled appearance. It has been found in Southern Norway, Sweden, various United States localities and on some beaches along the midcoast of South Australia.

  6. Peridot - Wikipedia

    en.wikipedia.org/wiki/Peridot

    The most common mineral inclusion in peridot is the chromium-rich mineral chromite. Magnesium-rich minerals also can exist in the form of pyrope and magnesiochromite. These two types of mineral inclusions typically surrounded lily-pad cleavages. Biotite flakes appear flat, brown, translucent, and tabular.

  7. Gypsum - Wikipedia

    en.wikipedia.org/wiki/Gypsum

    It also forms some of the largest crystals found in nature, up to 12 m (39 ft) long, in the form of selenite. Occurrence. Gypsum is a common mineral, with thick and extensive evaporite beds in association with sedimentary rocks. Deposits are known to occur in strata from as far back as the Archaean eon.

  8. Jadeite - Wikipedia

    en.wikipedia.org/wiki/Jadeite

    Jadeite is a pyroxene mineral with composition Na Al Si 2 O 6. It is hard ( Mohs hardness of about 6.5 to 7.0), very tough, and dense, with a specific gravity of about 3.4. It is found in a wide range of colors, but is most often found in shades of green or white. Jadeite is formed only in the subduction zones of continental margins, where rock ...

  9. Peridotite - Wikipedia

    en.wikipedia.org/wiki/Peridotite

    Peridotite ( US: / ˈpɛrɪdoʊˌtaɪt, pəˈrɪdə -/ PERR-ih-doh-tyte, pə-RID-ə-) is a dense, coarse-grained igneous rock consisting mostly of the silicate minerals olivine and pyroxene. Peridotite is ultramafic, as the rock contains less than 45% silica. It is high in magnesium (Mg 2+ ), reflecting the high proportions of magnesium-rich ...

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