Oolite or oölite (from Ancient Greek ᾠόν (ōión) 'egg stone') [1] is a sedimentary rock formed from ooids, spherical grains composed of concentric layers. [2] Strictly, oolites consist of ooids of diameter 0.25–2 millimetres; rocks composed of ooids larger than 2 mm are called pisolites .

The Clypeus Grit is a pale grey to pinkish brown rock which can be either fine or coarse-grained. It can be ooidal or peloidal, containing bioclastic fragments. The Clypeus grit can therefore be described as either a packstone or a grainstone, with large orange-skinned peloids/pisoids and aggregate grains; common whole shells especially in ...

Oölite, ovoid or spherical crystalline deposit with a concentric or radial structure; most are composed of calcium carbonate, but some are composed of silica, siderite, calcium phosphate, iron silicate, or iron oxide. Oölite diameters range from …

Oolite is a sedimentary rock formed from ooids, spherical grains which are composed of concentric layers of calcite. Oolite is available in black, blue, brown, cream, green, grey, pink, red, silver, white, yellow colors. The streak of a rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Oolite ...

Oolite is a sedimentary rock made up of ooids (ooliths) that are cemented together. Most oolites are limestones — ooids are made of calcium carbonate (minerals aragonite or calcite). Ooids are spheroidal grains with a nucleus and mineral cortex accreted around it which increases in sphericity with distance from the nucleus.

In petrology it denotes a type of rock structure characterized by the presence of minute spherical grains resembling the roe of a fish; if the grains become larger, the structure is said to be pisolitic (Gr. irivos, pea). In stratigraphical geology, the oolite is a division of the Jurassic system (q.v.).

A pale grey to off-white or yellowish limestone, peloidal wackestone and packstone with subordinate ooidal and shelly grainstones, recrystallised limestone and/or hardgrounds at some levels with rare sandy limestone, clayey limestone, marl and mudstone or clay.

Oolite is a type of shallow-water sediment composed of evenly coated grains that typically form near the palaeo-equator, within around 30° north and south latitude. It serves as a valuable proxy for understanding past palaeoceanographic conditions such as water-energy levels, water depths, salinity, and climate conditions.

2021年4月27日 · Oolite, somewhat magnified. Like other small grains, ooids can be cemented together to form a kind of rock. Rock formed from Calcium carbonate ooids is, by definition, a form of limestone , and is known as oolitic limestone or oolite .

Oolites form when layers of calcite are deposited around a sand grain or fossil piece and are rolled around in calm water, which makes them round. What is Oolite? In this section, we will learn more about properties of Oolite i.e. physical and thermal properties.