#ooid

[camblorite]

Ooids in thin section.

Ooids are spherical bodies of calcium carbonate with an internal structure of concentric layers. Its nucleus can be a fragment of other carbonate material or clastic sediment.

[elswere-1]

ooids & Jurassic oyster.

Science under cut

ooid with sparry isopachous cement, its a cut surface surface (notice the ooids are sliced, indicating boring on a beach hardground))

Crystalline top is low-Mg oyster shell (perpetrator of said boring)

((Brown plain polar, grey is crosspolar))

[geologyjohnson]

Stuid the ooid geology themed shirts, get one at the link below. https://everpress.com/stuid-the-ooid

[geologyjohnson]

Internal lamination with syn-depositional deformation in a 1. 3 billion year old #iron #silicate #ooid, this means the ooid was still soft and squishy when it was buried. Veiw is ~1 mm across #geology #precambrian #mesoproterozoic https://www.instagram.com/p/Bw4B5zCJxC3/?utm_source=ig_tumblr_share&igshid=d9cf3pd7yw0f

[little-maison]

[little-maison]

[little-maison]

[dream-small-do-big]

Ooid Wednesday But what is an ooid? Ooids are spheroidal sedimentary grains composed of calcium carbonate or iron such as these ooids from a banded iron formation.