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  2. Quartz Hills - Wikipedia

    en.wikipedia.org/wiki/Quartz_Hills

    Marie Byrd Land. Range coordinates. 85°56′S 132°50′W. /  85.933°S 132.833°W  / -85.933; -132.833. The Quartz Hills ( 85°56′S 132°50′W) is an arcuate cluster of largely ice-free hills and peaks found immediately south of Colorado Glacier along the west side of Reedy Glacier. They are part of the Transantarctic Mountains of ...

  3. Rhodochrosite - Wikipedia

    en.wikipedia.org/wiki/Rhodochrosite

    Rhodochrosite is a manganese carbonate mineral with chemical composition MnCO 3. In its pure form (rare), it is typically a rose-red colour, [5] but it can also be shades of pink to pale brown. It streaks white, [6] and its Mohs hardness varies between 3.5 and 4.5. Its specific gravity is between 3.45 and 3.6. [7]

  4. List of quarries in the United States - Wikipedia

    en.wikipedia.org/wiki/List_of_quarries_in_the...

    Chile Bar Slate company quarry, off of highway CA193 next to the American River near Placerville, California; Limestone quarry near Auburn, California of the Mountain Quarries Company of San Francisco, a subsidiary of Pacific Portland Cement Company, near confluence of the North Fork and the Middle Fork of the American River.

  5. Desert rose (crystal) - Wikipedia

    en.wikipedia.org/wiki/Desert_rose_(crystal)

    A desert rose is an intricate rose -like formation of crystal clusters of gypsum or baryte, which include abundant sand grains. [1] The "petals" are crystals flattened on the c axis, fanning open in radiating clusters. The rosette crystal habit tends to occur when the crystals form in arid sandy conditions, [1] such as the evaporation of a ...

  6. 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 ...

  7. Geology of the Dallas–Fort Worth Metroplex - Wikipedia

    en.wikipedia.org/wiki/Geology_of_the_Dallas...

    Cretaceous Formations of the Dallas-Fort Worth Metroplex Geologic map and the labeled geologic formations that lie directly beneath the surface in Dallas County Cretaceous formations of Texas Where the DFW Metroplex was located during the last super continent known as Pangea Placement of Tectonic Plates and DFW location around ≈94 million years ago The Cretaceous rocks in the DFW Metroplex ...

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