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  2. 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 ]

  3. Turquoise - Wikipedia

    en.wikipedia.org/wiki/Turquoise

    Natural resins, bitumen and wax were used to bond the turquoise to the objects' base material; this was usually wood, but bone and shell were also used. Like the Aztecs, the Pueblo, Navajo and Apache tribes cherished turquoise for its amuletic use; the latter tribe believe the stone to afford the archer dead aim. In Navajo culture it is used ...

  4. List of gemstones by species - Wikipedia

    en.wikipedia.org/wiki/List_of_gemstones_by_species

    This is a list of gemstones, organized by species and types. Minerals There ... Turquoise; Ulexite; Ussingite; Vanadinite; Variscite; Väyrynenite; Vesuvianite (idocrase)

  5. Sandstone - Wikipedia

    en.wikipedia.org/wiki/Sandstone

    Dott's (1964) sandstone classification scheme is one of many such schemes used by geologists for classifying sandstones. Dott's scheme is a modification of Gilbert's classification of silicate sandstones, and it incorporates R.L. Folk's dual textural and compositional maturity concepts into one classification system. [25]

  6. 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 ...

  7. Matrix (geology) - Wikipedia

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

    Many sandstones are held together by an infinitesimal amount of colloid or cryptocrystalline silica; when freshly dug from the quarry they are soft and easily trimmed, but after exposure to the air for some time they become much harder, as their siliceous cement sets and passes into a rigid condition. Others contain fine scales of kaolin or of ...

  8. 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 ...

  9. Sedimentology - Wikipedia

    en.wikipedia.org/wiki/Sedimentology

    Art: marble, although a metamorphosed limestone, is an example of the use of sedimentary rocks in the pursuit of aesthetics and art; Architectural uses: stone derived from sedimentary rocks is used for dimension stone and in architecture, notably slate (metamorphosed shale) for roofing, sandstone for load-bearing buttresses

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