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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.
Ironsand, also known as iron-sand or iron sand, is a type of sand with heavy concentrations of iron. It is typically dark grey or blackish in color. It is typically dark grey or blackish in color. It is composed mainly of magnetite , Fe 3 O 4 , and also contains small amounts of titanium, silica, manganese, calcium and vanadium.
Marine clay is a particle of soil that is dedicated to a particle size class, this is usually associated with USDA's classification with sand at 0.05mm, silt at 0.05-.002mm and clay being less than 0.002 mm in diameter.
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Adams Gate at Bamberg Cathedral made of Burgpreppach Sandstone Quarry in Worzeldorf (Nuremberg). Abtswind Sandstone: on the Friedrichsberg near Abtswind; Burgpreppach Sandstone: Burgpreppach
Monazite sand from Brazil was first noticed in sand carried in ship's ballast by Carl Auer von Welsbach in the 1880s. Von Welsbach was looking for thorium for his newly invented incandescent mantles. Monazite sand was quickly adopted as the thorium source and became the foundation of the rare-earth industry.
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sand ≥ 50% of coarse fraction passes No.4 (4.75 mm) sieve clean sand SW well-graded sand, fine to coarse sand SP poorly graded sand sand with >12% fines SM silty sand SC clayey sand Fine grained soils 50% or more passing the No.200 (0.075 mm) sieve silt and clay liquid limit < 50 inorganic: ML silt CL lean clay organic: OL organic silt ...