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  2. Greywacke - Wikipedia

    en.wikipedia.org/wiki/Greywacke

    Greywacke or graywacke (German grauwacke, signifying a grey, earthy rock) is a variety of sandstone generally characterized by its hardness (6–7 on Mohs scale), dark color, and poorly sorted angular grains of quartz, feldspar, and small rock fragments or sand-size lithic fragments set in a compact, clay-fine matrix.

  3. List of sandstones - Wikipedia

    en.wikipedia.org/wiki/List_of_sandstones

    Bollingen Sandstone (also Buchberg Sandstone, Uznaberg Sandstone, Bollinger-Lehholz Sandstone and Güntliweid Sandstone): Rapperswil-Jona by the Upper Lake Zürich Grès à cailloux roulés : near Avenches

  4. Stones of India - Wikipedia

    en.wikipedia.org/wiki/Stones_of_India

    Indian Green Marble: It is found in Rajasthan, India; Indian Green Marble's most quarries are situated in Kesariyaji, which is 60 km far from Udaipur, Rajasthan India. This Indian green marble is known by name all over the world. In Europe, people know Indian green marble as a Verde Guatemala. Many varieties are available in Indian green marble.

  5. List of rock types - Wikipedia

    en.wikipedia.org/wiki/List_of_rock_types

    Greywacke – Sandstone with angular grains in a clay-fine matrix; Gritstone – Hard, coarse-grained, siliceous sandstone; Ironstone – Sedimentary rock that contains a substantial proportion of iron ore; Itacolumite – Porous sandstone known for flexibility; Jaspillite – Banded mixture of hematite and quartz

  6. Concretion - Wikipedia

    en.wikipedia.org/wiki/Concretion

    Vaqueros Formation sandstone with concretions A mosaic of images showing spherules, some partly embedded, spread over (smaller) soil grains on the Martian surface Concretions are found in a variety of rocks, but are particularly common in shales , siltstones , and sandstones . [ 30 ]

  7. List of quarries in the United States - Wikipedia

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

    A Paleo-Indian fluted point, a very rare stone tool, was among them.[1] At the time of its discovery it was the oldest such site east of the Mississippi.[2] The site has been at the center of a battle between local archaeologists and the Pleasant Valley-based Dutchess Quarry and Supply Company , which actively produces dolomite gravel on the site."