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  2. Quartz - Wikipedia

    en.wikipedia.org/wiki/Quartz

    Quartz is, therefore, classified structurally as a framework silicate mineral and compositionally as an oxide mineral. Quartz is the second most abundant mineral in Earth's continental crust, behind feldspar. [10] Quartz exists in two forms, the normal α-quartz and the high-temperature β-quartz, both of which are chiral. The transformation ...

  3. Moss agate - Wikipedia

    en.wikipedia.org/wiki/Moss_agate

    Moss agate. Moss agate is a semi-precious gemstone formed from silicon dioxide. It is a form of chalcedony which includes minerals of a green color embedded in the stone, forming filaments and other patterns suggestive of moss. [1] The field is a clear or milky-white quartz, and the included minerals are mainly oxides of manganese or iron.

  4. Zunyite - Wikipedia

    en.wikipedia.org/wiki/Zunyite

    Zunyite occurs in highly aluminous shales and hydrothermally altered volcanic rocks. It occurs in association with pyrophyllite, kaolinite, alunite, diaspore, rutile, pyrite, hematite and quartz. [2] It was discovered in 1884, and named for its discovery site, the Zuni mine in the Silverton District, San Juan County, Colorado. [3]

  5. Adularescence - Wikipedia

    en.wikipedia.org/wiki/Adularescence

    Adularescence. Adularescence in a moonstone cabochon, Minas Gerais, Brazil. The specimen's diameter is 23 mm (0.91 in). Adularescence (/ ˌædʒələˈrɛsəns / AJ-ə-lə-RES-əns) is an optical phenomenon that is produced in gemstones like moonstone. The optical effect is similar to labradorescence and aventurescence.

  6. List of minerals - Wikipedia

    en.wikipedia.org/wiki/List_of_minerals

    This is a list of minerals which have Wikipedia articles. Minerals are distinguished by various chemical and physical properties. ... Milky quartz (a cloudy white quartz)

  7. List of rock types - Wikipedia

    en.wikipedia.org/wiki/List_of_rock_types

    Epidosite – Hydrothermally altered epidote- and quartz-bearing rock; Felsite – Very fine-grained volcanic rock that sometimes contains larger crystals; Flint – Cryptocrystalline form of the mineral quartz; Ganister – Hard, fine-grained quartzose sandstone, or orthoquartzite; Gossan – Intensely oxidized, weathered or decomposed rock

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