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  2. 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.

  3. List of U.S. state minerals, rocks, stones and gemstones

    en.wikipedia.org/wiki/List_of_U.S._state...

    South Dakota [64] [65] Rose quartz (1966) Fairburn agate (1966) and State Jewelry: Black Hills Gold: Tennessee [66] Agate (2009) Limestone (from 1979 to present) and ...

  4. Rosebud Indian Reservation - Wikipedia

    en.wikipedia.org/wiki/Rosebud_Indian_Reservation

    Website. rosebudsiouxtribe-nsn.gov. The Rosebud Indian Reservation is an Indian reservation in South Dakota, United States. It is the home of the federally recognized Rosebud Sioux Tribe, who are Sicangu, a band of Lakota people. The Lakota name Sicangu Oyate translates as the "Burnt Thigh Nation", also known by the French term, the Brulé Sioux.

  5. 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 ...

  6. Pegmatite - Wikipedia

    en.wikipedia.org/wiki/Pegmatite

    Pegmatite. A pegmatite is an igneous rock showing a very coarse texture, with large interlocking crystals usually greater in size than 1 cm (0.4 in) and sometimes greater than 1 meter (3 ft). Most pegmatites are composed of quartz, feldspar, and mica, having a similar silicic composition to granite.

  7. 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 ...

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