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The color shifts from reddish to greenish as iron in the oxidized state is converted to iron in the reduced state. [6] Black shale results from the presence of greater than one percent carbonaceous material and indicates a reducing environment. [4] Pale blue to blue-green shales typically are rich in carbonate minerals. [7]
This is an accepted version of this page This is the latest accepted revision, reviewed on 20 February 2025. Variety of the color blue For other uses, see Shades of Blue (disambiguation). "Shade of Blue" redirects here. For the song by Black Rebel Motorcycle Club, see Shade of Blue (song). For the R&B/funk band, see Shade of Blue (band). Blue Wavelength 440–490 nm Common connotations ...
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Blue eyes are most common in Ireland, the Baltic Sea area and Northern Europe, [52] and are also found in Eastern, Central, and Southern Europe. Blue eyes are also found in parts of Western Asia, most notably in Afghanistan, Syria, Iraq, and Iran. [53] In Estonia, 99% of people have blue eyes.
Bituminous coal seam in West Virginia Limey shale overlaid by limestone. Cumberland Plateau, Tennessee Dolomite crystals from Touissite, Morocco Turbidite (Gorgoglione Flysch), Miocene, South Italy. Argillite – Sedimentary rock, mostly of indurated clay particles; Arkose – Type of sandstone containing at least 25% feldspar
It is called Blue Valley because of the blue color of the Mancos Shale that is the dominant geological formation of the Fremont river valley at that elevation. Blue Valley is the location of several ghost towns including Caineville, Giles, and Elephant.
Bentonite layers from an ancient deposit of weathered volcanic ash tuff in Wyoming Gray shale and bentonites (Benton Shale; Colorado Springs, Colorado). Bentonite (/ ˈ b ɛ n t ə n aɪ t / BEN-tə-nyte) [1] [2] is an absorbent swelling clay consisting mostly of montmorillonite (a type of smectite) which can either be Na-montmorillonite or Ca-montmorillonite.
The pigment is noteworthy for its vibrant, near-perfect blue color and unusually high NIR reflectance. [1] [2] The color may be adjusted by varying the In/Mn ratio in the pigment's base formula of YIn 1−x Mn x O 3, but the bluest pigment, YIn 0.8 Mn 0.2 O 3, has a color comparable to standard cobalt blue CoAl 2 O 4 pigments. [2]