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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.
The Kensington Runestone is a slab of greywacke stone covered in runes that was discovered in Western Minnesota, United States, in 1898. Olof Ohman, a Swedish immigrant , reported that he unearthed it from a field in the largely rural township of Solem in Douglas County .
There is uncertainty on how to translate the proper name Omarolluk (and omar rocks). According to the records of the Canada Centre for Mapping and Earth Observation Natural Resources, the features Omarolluk Sound and Omarolluk Formation were named after Omarolluk, an Inuk man who accompanied and guided R. J. Flaherty on numerous geological surveys of the Belcher Islands and elsewhere in the ...
Greywacke Arch is a "Saracenic" pointed arch whose apex is in the center. [77] [78] The vault is 11 feet 3 inches (3.43 m) tall, 18-foot-3-inch (5.56 m) wide, and 56 feet (17 m) long. The exterior of Greywacke Arch is lined with grey Manhattan sandstone, greywacke from the Hudson Valley, and brownstone from Passaic, New Jersey. The inside of ...
Dry Rigg Quarry is a quarry at Helwith Bridge in North Yorkshire, England, located within the Yorkshire Dales National Park.The quarry produces a hard-wearing gritstone (also known as greywacke) which is listed as being nationally important for road building, and is one of four in the Yorkshire Dales National Park that produces this type of aggregate.
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
The Franciscan Complex is dominated by greywacke sandstones, shales and conglomerates which have experienced low-grade metamorphism. Other important lithologies include chert, basalt, limestone, serpentinite, and high-pressure, low-temperature metabasites (blueschists and eclogites) and meta-limestones.
Cartouche 24, Abydos King List. Temple of Seti I, Abydos, Egypt. Menkaure or Menkaura (Egyptian transliteration: mn-kꜣw-rꜥ; c. 2550 BC - c. 2503 BC) was a king of the Fourth Dynasty of Egypt during the Old Kingdom.