Glauconite is an iron potassium phyllosilicate (mica group) mineral of characteristic green color which is very friable[5] and has very low weathering resistance.
It crystallizes with a monoclinic geometry. Its name is derived from the Greek glaucos (γλαυκός) meaning 'bluish green', referring to the common blue-green color of the mineral; its sheen (mica glimmer) and blue-green color. Its color ranges from olive green, black green to bluish green, and yellowish on exposed surfaces due to oxidation. In the Mohs scale it has a hardness of 2, roughly the same as gypsum.[6] The relative specific gravity range is 2.4–2.95. It is normally found as dark green rounded concretions with the dimensions of a sand grain. It can be confused with chlorite (also of green color) or with a clay mineral. Glauconite has the chemical formula (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2.
Glauconite particles are one of the main components of greensand, glauconitic siltstone and glauconitic sandstone. Glauconite has been called a marl in an old and broad sense of that word. Thus references to "greensand marl" sometimes refer specifically to glauconite. The Glauconitic Marl formation is named after it, and there is a glauconitic sandstone formation in the Mannville Group of Western Canada.
Glauconite is an iron potassium phyllosilicate (mica group) mineral of characteristic green color which is very friable and has very low weathering resistance...
consist of a mixture of mixed-layer clay minerals, such as smectite and glauconite. Greensand is also loosely applied to any glauconitic sediment. Greensand...
low grade metamorphic rocks. The iron-rich member of the illite group, glauconite, in sediments can be differentiated by x-ray analysis. The cation-exchange...
It is an inorganic pigment derived from the minerals celadonite and glauconite. Lists of colors W3C TR CSS3 Color Module, HTML4 color keywords Maerz...
Glauconitic marl is marl containing pellets of glauconite, a clay mineral that gives the marl a green color. Glauconite is characteristic of sediments deposited...
green, is an inorganic pigment derived from the minerals celadonite and glauconite. Its chemical formula is K[(Al,Fe3+),(Fe2+,Mg)](AlSi3,Si4)O10(OH)2. First...
essential nutritional requirement for animals and humans. Manure and glauconite (greensand) are low-potassium-content sources that can be profitably transported...
Kauai, Hawaii 2. Dune sand from the Gobi Desert 3. Quartz sand with green glauconite from Estonia 4. Volcanic sand with reddish weathered basalt from Maui...
Curry, D.; Hunziker, J. Z. (1978). "Radiometric dates from NW European glauconites and the Palaeogene time-scale". Journal of the Geological Society. 135...
though certain minerals including glauconite, melanterite, and celadonite can also give soil a green color. Glauconite soils form from select marine sedimentary...
nearby) granitic rock outcrop. Some sands contain magnetite, chlorite, glauconite, or gypsum. Sands rich in magnetite are dark to black in color, as are...
tons worth R$4.7 million). There are also deposits of verdete slate, a glauconite-bearing mineral. Minas Gerais had 47.19% of the value of the production...
fossils, while the coarser sandstones often have fractions of micas and glauconite. In a continental collision, a subducting tectonic plate pushes on the...
Obasi; Dennis O. Terry Jr.; George H. Myer; David E. Grandstaff (2011). "Glauconite Composition and Morphology, Shocked Quartz, and the Origin of the Cretaceous(...
and durable stone found in southern New Zealand Greensand (geology), glauconite bearing sandstone and a geologic formation in the UK Greenschist, metamorphosed...
cemented, it is known as spicular chert. They are found in association with glauconite-rich sandstone, black shale, clay-rich limestone, phosphorites, and other...
bearing horizon being referred to as "Blue Earth", so named due to its glauconite content. The formation is exposed in the northern part of the Sambia Peninsula...
formed by quarrying the sand needed for the brick. It takes its name from glauconite that, along with its depth, gives its water a blue-green tint. Today it...
an iron oxidation reduction phosphorus cycle. This cycle can also form glauconite which is normally associated with modern and ancient phosphorites. Insular...
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