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  2. Quartzite - Wikipedia

    en.wikipedia.org/wiki/Quartzite

    Quartzite. Quartzite is a hard, non- foliated metamorphic rock which was originally pure quartz sandstone. [1][2] Sandstone is converted into quartzite through heating and pressure usually related to tectonic compression within orogenic belts. Pure quartzite is usually white to grey, though quartzites often occur in various shades of pink and ...

  3. Shinumo Quartzite - Wikipedia

    en.wikipedia.org/wiki/Shinumo_Quartzite

    The change in topographic expression, color, and the facies change, from quartz arenite, to mudstone and fine-grained arkose – is gradational. [2] [9] Between the three-member Tonto Group (above) and the Shinumo Quartzite, and the rest of the folded and faulted Unkar Group, is a prominent angular unconformity, which is part of the Great ...

  4. Chalcedony - Wikipedia

    en.wikipedia.org/wiki/Chalcedony

    Chalcedony. Chalcedony (/ kælˈsɛdəni / kal-SED-ə-nee, or / ˈkælsəˌdoʊni / KAL-sə-doh-nee) [2] is a cryptocrystalline form of silica, composed of very fine intergrowths of quartz and moganite. [3] These are both silica minerals, but they differ in that quartz has a trigonal crystal structure, while moganite is monoclinic.

  5. Hardnesses of the elements (data page) - Wikipedia

    en.wikipedia.org/wiki/Hardnesses_of_the_elements...

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  6. Gemstones in the Bible - Wikipedia

    en.wikipedia.org/wiki/Gemstones_in_the_Bible

    The modern chrysolite is a green oblong hexagonal prism of unequal sides terminated by two triangular pyramids. Topaz, or ancient chrysolite, is an octangular prism of an orange-yellow colour; it is composed of alumina, silica, hydrofluoric acid, and iron. it is found in Ceylon, Arabia, and Egypt.

  7. What's the Difference Between Quartz and Quartzite? - AOL

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  8. Sioux Quartzite - Wikipedia

    en.wikipedia.org/wiki/Sioux_quartzite

    Sioux Quartzite at Falls Park, Sioux Falls, South Dakota Cross-bedding in the Sioux Quartzite, Blue Mounds State Park, Minnesota, United States.. The Sioux Quartzite is a Proterozoic quartzite that is found in the region around the intersection of Minnesota, South Dakota, and Iowa, and correlates with other rock units throughout the upper midwestern and southwestern United States.

  9. Periodic table - Wikipedia

    en.wikipedia.org/wiki/Periodic_table

    The periodic table, also known as the periodic table of the elements, is an ordered arrangement of the chemical elements into rows (" periods ") and columns (" groups "). It is an icon of chemistry and is widely used in physics and other sciences. It is a depiction of the periodic law, which states that when the elements are arranged in order ...

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