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  2. Quartz - Wikipedia

    en.wikipedia.org/wiki/Quartz

    Milk quartz or milky quartz is the most common variety of crystalline quartz. The white color is caused by minute fluid inclusions of gas, liquid, or both, trapped during crystal formation, [ 44 ] making it of little value for optical and quality gemstone applications.

  3. Opal - Wikipedia

    en.wikipedia.org/wiki/Opal

    Opal is a hydrated amorphous form of silica (SiO 2 · n H 2 O); its water content may range from 3% to 21% by weight, but is usually between 6% and 10%. Due to its amorphous property, it is classified as a mineraloid, unlike crystalline forms of silica, which are considered minerals. It is deposited at a relatively low temperature and may occur ...

  4. 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.

  5. 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.

  6. List of rock types - Wikipedia

    en.wikipedia.org/wiki/List_of_rock_types

    Claystone – Clastic sedimentary rock composed primarily of clay-sized particles. Coal – Combustible sedimentary rock composed primarily of carbon. Conglomerate – Sedimentary rock composed of smaller rock fragments. Coquina – Sedimentary rock that is composed mostly of fragments of shells.

  7. Lantern Hill - Wikipedia

    en.wikipedia.org/wiki/Lantern_Hill

    The hill is composed mostly of high-purity milky quartz and it occupies the inactive Lantern Hill Fault, which runs south into the Atlantic Ocean. Analysis of the quartz reveals that it is 238 million years old—the mid-Triassic Period of the Mesozoic Era in geologic time, according to current theories. The formation of the fault and the ...

  8. 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]

  9. Milky quartz - Wikipedia

    en.wikipedia.org/?title=Milky_quartz&redirect=no

    Quartz#Milky quartz; This page is a redirect. The following categories are used to track and monitor this redirect: To a section: This is a redirect from a topic that ...

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