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  2. Turquoise - Wikipedia

    en.wikipedia.org/wiki/Turquoise

    Turquoise is an opaque, blue-to-green mineral that is a hydrous phosphate of copper and aluminium, with the chemical formula Cu Al 6 (PO 4) 4 8 ·4H 2 O.It is rare and valuable in finer grades and has been prized as a gemstone for millennia due to its hue.

  3. List of sandstones - Wikipedia

    en.wikipedia.org/wiki/List_of_sandstones

    This is a list of types of sandstone that have been or are used economically as natural stone for building and other commercial or artistic purposes. Trans-regional [ edit ]

  4. Lithic fragment (geology) - Wikipedia

    en.wikipedia.org/wiki/Lithic_fragment_(geology)

    Lithic fragments, or lithics, are pieces of other rocks that have been eroded down to sand size and now are sand grains in a sedimentary rock.They were first described and named (in their modern definitions) by Bill Dickinson in 1970. [1]

  5. Sandstone - Wikipedia

    en.wikipedia.org/wiki/Sandstone

    Sandstone is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) silicate grains, cemented together by another mineral. Sandstones comprise about 20–25% of all sedimentary rocks.

  6. Lithic sandstone - Wikipedia

    en.wikipedia.org/wiki/Lithic_sandstone

    Lithic sandstones can have a speckled (salt and pepper) or gray color, and are usually associated with one specific type of lithic fragment (i.e., igneous, sedimentary, or metamorphic). [ 1 ] Tectonically, lithic sandstones often form in a wide variety sedimentary depositional environments (including fluvial , deltaic , and alluvial sediments ...

  7. Gemstone Meanings: Power and Significance of the 25 Most ...

    www.aol.com/gemstone-meanings-power-significance...

    Here are the most popular gemstone meanings. ... “Long prized for its healing properties, turquoise occurs naturally in several areas of the world, including the American southwest and Tibetan ...

  8. Flysch - Wikipedia

    en.wikipedia.org/wiki/Flysch

    Flysch (/ f l ɪ ʃ /) is a sequence of sedimentary rock layers that progress from deep-water and turbidity flow deposits to shallow-water shales and sandstones. It is deposited when a deep basin forms rapidly on the continental side of a mountain building episode.

  9. Conglomerate (geology) - Wikipedia

    en.wikipedia.org/wiki/Conglomerate_(geology)

    They are closely related to sandstones in origin, and exhibit many of the same types of sedimentary structures, such as tabular and trough cross-bedding and graded bedding. [ 1 ] [ 2 ] [ 3 ] Fanglomerates are poorly sorted, matrix-rich conglomerates that originated as debris flows on alluvial fans and likely contain the largest accumulations of ...

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