#glauconite

[geologyjohnson]

#ThinsectionThursday early #Jurassic tempestites where #crinoids have been converted from calcite to glauconite. The conversion has even preserved the micron scale detail of the stereom. Each image about 5 mm wide. #geology #paleontology #echinoderm

[biology-geology-beaches-india]

The Science Research Notebooks of Satyendra Sunkavally. Page.1A

[healthfitness235]

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Read more by clicking here...

[geologyjohnson]

When you stare into the #glauconite and the glauconite stares back across the aeons. #Precambrian #geology #sediment

[happy-geology]

1500万年前に日本海が深くなった証拠の地層　しましまの地層の基底が転換した瞬間の記録　4月上旬　山形県鶴岡市 #地学 #地層 #地質 #新潟大

Geology in snow. A contact between bioturbated sandy siltstone (lower) and biosiliceous shale (upper) with glauconite concentration at its base. Manifestation of the completion of the Miocene backarc opening at the region. Tsuruoka, Yamagata, Japan.

[earthstory]

Glauconite

The green pellets in this sandstone, seen in thin section where each grain is millimeter sized or smaller, represent a fascinating sedimentary environment. The mineral requires the presence of both oxygen-bearing and oxygen-poor environments to form; it contains iron(III) in its structure, requiring the presence of oxygen, but it is a clay mineral. The iron remains bonded to silicon atoms rather than forming a free oxide mineral as iron does when it rusts, requiring some level of oxygen limitation.

To form this mineral in common settings requires a source of small pellets of reducing, carbon-bearing material in a setting where there is normally plenty of oxygen. They commonly form during the decay of some organisms that make carbonate shells or, commonly, during the diagenesis of fecal pellets. These grains, particularly when dispersed in a quartz rich sandstone like this one, are often the remains of marine…waste.

These glauconite sands can be sorted and reprocessed via sedimentary processes; a mechanism for generating green sands that are fairly stable in the presence of oxygen.

-JBB

Image credit: https://flic.kr/p/PrGj1j

Reference: http://bit.ly/2gtaDrC http://rruff.info/doclib/hom/glauconite.pdf http://colourlex.com/project/green-earth/

[dream-small-do-big]

[clifd]

Limestone beds exposed in highway cut, Tennessee

Photos by Clif Doyal

*Note: This is one of the more unusual formations I have ever seen in sedimentary rock. Would any geology folks like to weigh in on what this is called? Is the green color caused by a copper oxide?

UPDATE: Thanks to @danceswithhippos and @xanswerxthatx for responding that the green color is likely caused from glauconite. Thanks to both of you for your input! 

2nd question: Does anyone know what caused the unusual wave formation?