File:Black phosphorite nodule (Nagoryany Formation, near-uppermost Neoproterozoic; Ushytsya River area, Khmelnitska Province, Ukraine) 2 (15323340672).jpg

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Black phosphorite nodule from the Precambrian of Ukraine. (5.7 centimeters across)

Phosphorites are calcium phosphate-rich sedimentary rocks, generally considered to have >15-20% phosphate content. Texturally, phosphorites can be obviously granular, with fossil fragments or oolites or peloids or lithic fragments, or they can be composed of extremely fine-grained, phosphate-rich mud. Compositionally, the phosphate component in phosphorites is principally a mix of apatite minerals: chlorapatite (Ca5(PO4)3Cl), fluorapatite (Ca5(PO4)3F), hydroxyapatite (Ca5(PO4)3OH)), and carbonate fluorapatite (Ca10(PO4,CO3)6F2-3).

Phosphorites are generally marine sedimentary rocks. They range in age from Precambrian to Holocene. In modern oceans, they tend to occur along the eastern margins of some ocean basins where deep-water upwelling occurs under areas of high biologic productivity.

Stratigraphy: Kalyus Member (Kalus Member; Kallyusa Member), Nagoryany Formation, Mogilev-Podolsky Series, upper Ediacaran, near-uppermost Neoproterozoic

Locality: at or near the Ushytsya (Ushitsa) River, near the town of Minkivtsi, eastern Dunayevetskiy Region, southern Khmelnitska Province, western Ukraine
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Source Black phosphorite nodule (Nagoryany Formation, near-uppermost Neoproterozoic; Ushytsya River area, Khmelnitska Province, Ukraine) 2
Author James St. John

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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/15323340672 (archive). It was reviewed on 6 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

6 December 2019

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current02:12, 6 December 2019Thumbnail for version as of 02:12, 6 December 20192,756 × 2,656 (2.85 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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