Glauconite

Iron potassium phyllosilicate mineral of characteristic green color which is very friable and has very low weathering resistance.

- Glauconite

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Greensand (glauconitic sandstone)

Greensand

Sand or sandstone which has a greenish color.

Sand or sandstone which has a greenish color.

Greensand (glauconitic sandstone)
Occurrence of glauconitic siltstone in the Serra da Saudade ridge, in the Alto Paranaíba region, Minas Gerais, Brazil.
A sample of Cretaceous greensand from near Swanage, Dorset.

These grains are called glauconies and consist of a mixture of mixed-layer clay minerals, such as smectite and glauconite mica.

Marl

Marl

Earthy material rich in carbonate minerals, clays, and silt.

Earthy material rich in carbonate minerals, clays, and silt.

Marl
Scala dei Turchi coastal marl formation, southern Sicily
Scheme of the transitional lithotypes from mud (or mudstone) to lime (or limestone), illustrating the definition of marl (marlstone) as a mix of calcium carbonate and clay
Geological profile along the tunnel as constructed. For most of its length the tunnel bores through a chalk marl stratum (layer)
Deposition from a Marl lake inside a sheltered paint can, taken from Siseebakwet Lake

Glauconitic marl is marl containing pellets of glauconite, a clay mineral that gives the mark a green color.

Sand dunes in the Idehan Ubari, Libya

Sand

Granular material composed of finely divided rock and mineral particles.

Granular material composed of finely divided rock and mineral particles.

Sand dunes in the Idehan Ubari, Libya
Depiction of sands: glass, dune, quartz volcanic, biogenic coral, pink coral volcanic, garnet, olivine. Samples are from the Gobi Desert, Estonia, Hawaii and the mainland United States. (1x1 cm each)
Heavy minerals (dark) in a quartz beach sand (Chennai, India)
Sand from Coral Pink Sand Dunes State Park, Utah. These are grains of quartz with a hematite coating providing the orange color.
Sand from Pismo Beach, California. Components are primarily quartz, chert, igneous rock, and shell fragments.
Close up of black volcanic sand from Perissa, Santorini, Greece
Scanning electron micrograph showing grains of sand
Pitted sand grains from the Western Desert, Egypt. Pitting is a consequence of wind transportation.
Sand grains of yellow building sand. Microscope Lumam P-8. EPI lighting. The photo of each grain of sand is the result of multifocal stacking.

Some sands contain magnetite, chlorite, glauconite, or gypsum.

Brass Point, one of the Seven Sisters

Chalk Group

Lithostratigraphic unit (a certain number of rock strata) which contains the Upper Cretaceous limestone succession in southern and eastern England.

Lithostratigraphic unit (a certain number of rock strata) which contains the Upper Cretaceous limestone succession in southern and eastern England.

Brass Point, one of the Seven Sisters
The Needles, (Isle of Wight); part of southern England's extensive chalk outcrop.
Fossil echinoid Echinocorys from the Chalk Group of England
Contact between two units of the lithostratigraphy of South England: the Chalk Group (left, white, upper unit) and the Greensand Formation (right, green, lower unit). Location: Lulworth Cove, near West Lulworth, Dorset, England.
The Wealden Anticline.
Ivinghoe Beacon, Chiltern Hills

The strata of this subgroup usually begin with the 'Glauconitic Marl Member' (formerly known as the Glauconitic or Chloritic Marl), named after the grains of the green minerals glauconite and chlorite which it contains.

Copper silicate mineral chrysocolla

Silicate mineral

Silicate minerals are rock-forming minerals made up of silicate groups.

Silicate minerals are rock-forming minerals made up of silicate groups.

Copper silicate mineral chrysocolla
Diatomaceous earth, a biogenic form of silica as viewed under a microscope. The imaged region measures approximately 1.13 by 0.69 mm.
Orthosilicate anion . The grey ball represents the silicon atom, and the red balls are the oxygen atoms.
Nesosilicate specimens at the Museum of Geology in South Dakota
Kyanite crystals (unknown scale)
Pyrosilicate anion.
Sorosilicate exhibit at Museum of Geology in South Dakota
Cyclosilicate specimens at the Museum of Geology, South Dakota
Pezzottaite
Bazzite.
Kaolinite
Silica family (SiO2 3D network), β-quartz.
The 3D aluminosilicate anion of synthetic zeolite ZSM-5.
Quartz
Lunar ferroan anorthosite (plagioclase feldspar) collected by Apollo 16 astronauts from the Lunar Highlands near Descartes Crater
6 units {{chem2|[Si6O18]}}, beryl (red: Si, blue: O)
3 units {{chem2|[Si3O9]}}, benitoite
4 units {{chem2|[Si4O12]}}, papagoite
9 units {{chem2|[Si9O27]}}, eudialyte
6 units, double ring {{chem2|[Si6O15]}}, milarite
Inosilicate, pyroxene family, with 2-periodic single chain {{chem2|(Si2O6)}}, diopside
Inosilicate, clinoamphibole, with 2-periodic double chains {{chem2|(Si4O11)}}, tremolite
Inosilicate, unbranched 3-periodic single chain of wollastonite
Inosilicate with 5-periodic single chain, rhodonite
Inosilicate with cyclic branched 8-periodic chain, pellyite
Phyllosilicate, mica group, muscovite (red: Si, blue: O)
Phyllosilicate, single net of tetrahedra with 4-membered rings, apophyllite-(KF)-apophyllite-(KOH) series
Phyllosilicate, single tetrahedral nets of 6-membered rings, pyrosmalite-(Fe)-pyrosmalite-(Mn) series
Phyllosilicate, single tetrahedral nets of 6-membered rings, zeophyllite
Phyllosilicate, double nets with 4- and 6-membered rings, carletonite

Glauconite – (K,Na)(Al,Mg,Fe)2(Si,Al)4O10(OH)2

The Permian through Jurassic strata of the Colorado Plateau area of southeastern Utah demonstrate the principles of stratigraphy.

Mannville Group

Stratigraphical unit of Cretaceous age in the Western Canadian Sedimentary Basin.

Stratigraphical unit of Cretaceous age in the Western Canadian Sedimentary Basin.

The Permian through Jurassic strata of the Colorado Plateau area of southeastern Utah demonstrate the principles of stratigraphy.

The Mannville Group consists of interbedded continental sand and shale in the base, followed by a calcareous sandstone member, marine shale, glauconitic sandstone and salt and pepper sandstone.

Authigenic minerals in marine sediment

Authigenesis

Process whereby a mineral or sedimentary rock deposit is generated where it is found or observed.

Process whereby a mineral or sedimentary rock deposit is generated where it is found or observed.

Authigenic minerals in marine sediment
Authigenic glauconite from Dorset, England

glauconite

Minas Gerais

State in Southeastern Brazil.

State in Southeastern Brazil.

Town of Bom Jesus de Matosinhos c.1821–1825
Maxakalisaurus.
Baruch, 18th century Baroque sculpture, by Aleijadinho
People of Minas Gerais in the 1820s
Downtown of Uberlândia, largest city in the state after Belo Horizonte.
Indians visiting a farm plantation in Minas Gerais, 1824
Imperial topaz of Minas Gerais
This satellite photograph illustrates the diverse agricultural landscape in the western part of Minas Gerais.
Coffee in São João do Manhuaçu
Strawberry in Estiva
Milk extraction in Ouro Preto
Iron mine in Itabira
Extraction of niobium in Araxá
Aquamarine of Minas Gerais
Usiminas headquarters in Belo Horizonte
Governador Valadares City
Pontifical Catholic University of Minas Gerais
Federal University of Viçosa
Baroque churches in Mariana.
Carlos Drummond de Andrade, considered one of the most talented Brazilian poets. He often wrote about Itabira the interior of the state, the place where he was born and raised and where his parents were from.
Romeu e Julieta (left; queijo Minas with goiabada) and doce de leite (right), two sweets typical of Minas Gerais.
Yayoi Kusama at the Inhotim in Brumadinho
Milton Nascimento, one of the most iconic musicians of Minas Gerais, 17 March 1969.
Palácio Tiradentes, the seat of government of Minas Gerais
Fernão Dias highway
Mineirão stadium in Belo Horizonte.
Belo Horizonte
Downtown of Uberlândia, largest city in the state after Belo Horizonte.
Governador Valadares City
Pontifical Catholic University of Minas Gerais
Confins International Airport
Belo Horizonte

There are also deposits of Verdete slate, a glauconite-bearing mineral.

Green earth pigment

Green earth

Green earth pigment

Green earth, also known as terre verte and Verona green, is an inorganic pigment derived from the minerals celadonite and glauconite.

The Grand Canyon from Navajo Point. The Colorado River is to the right and the North Rim is visible at all in the distance. The view shows nearly every sedimentary layer described in this article.

Geology of the Grand Canyon area

The geology of the Grand Canyon area includes one of the most complete and studied sequences of rock on Earth.

The geology of the Grand Canyon area includes one of the most complete and studied sequences of rock on Earth.

The Grand Canyon from Navajo Point. The Colorado River is to the right and the North Rim is visible at all in the distance. The view shows nearly every sedimentary layer described in this article.
figure 1
Stones from each of the strata in an exhibit in Heritage Square in Flagstaff
The Vishnu Basement Rocks were deposited as volcanic rocks and sediments but were later metamorphosed and intruded by igneous rock.
The Cardenas Basalt was laid on top of the rest of the Grand Canyon Supergroup
Sixtymile Formation is the last rock unit in the Chuar Group
Tonto Group is most easily seen as the broad Tonto Platform just above the Colorado River
Temple Butte Formation was deposited on the eroded surface of the Muav Limestone. It in turn was buried by Redwall Limestone
Supai Group with a stranded log from a pre-Glen Canyon Dam flood
Lizard-like animals left their footprints in Coconino Sandstone
Fossils, such as this brachiopod and fragments of crinoids, are common in the Toroweap and Kaibab formations
Reddish Moenkopi outcrop below volcanic rubble on Red Butte
Uplift of the Colorado Plateaus forced rivers to cut down faster.
The Colorado River had cut down to nearly the current depth of the Grand Canyon by 1.2 million years ago.
Vulcan's Throne volcano above Lava Falls. Lava flows, such as this heavily eroded remnant, once dammed the Colorado River.
Historic rockfall on the north rim.
Glen Canyon Dam has greatly reduced the amount of sediment transported by the Colorado River through the Grand Canyon.
Grand Canyon Trail of Time – Folded Vishnu schist basement rock.

Glauconite is responsible for the green coloration of the Bright Angel.