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See all on WikipediaConcretion - Wikipedia
There is an important distinction to draw between concretions and nodules. Concretions are formed from mineral precipitation around some kind of nucleus while a nodule is a replacement body. Descriptions dating from the 18th century attest to the fact that concretions have long been regarded as … See more
A concretion is a hard and compact mass formed by the precipitation of mineral cement within the spaces between particles, and is found in sedimentary rock or soil. Concretions are often ovoid or spherical in shape, … See more
Concretions vary in shape, hardness and size, ranging from objects that require a magnifying lens to be clearly visible to huge bodies three meters in diameter and weighing several … See more
Concretions are found in a variety of rocks, but are particularly common in shales, siltstones, and sandstones. They often outwardly resemble fossils or rocks that look as if they do not … See more
• Bowling Ball Beach – Beach in Mendocino County, California, US
• Caliche, also known as calcrete – Calcium carbonate based concretion of sediment in arid and semi-arid soils
• Champ Island – Island in Franz Josef Land, Russia See moreDetailed studies have demonstrated that concretions form after sediments are buried but before the sediment is fully lithified during diagenesis. They typically form when a mineral … See more
Concretions are commonly composed of a mineral present as a minor component of the host rock. For example, concretions in sandstones or shales are commonly formed of a carbonate mineral such as calcite; those in limestones are commonly an amorphous or … See more
Concretions vary considerably in their compositions, shapes, sizes and modes of origin.
Septarian concretions
Septarian … See moreWikipedia text under CC-BY-SA license CONCRETIONS AND NODULES IN NORTH DAKOTA
Sep 16, 2015 · North Dakota, especially in the wondrously sculpted badland areas of the west, has a fantastic variety of concretions and nodules. Some are the size and shape of petrified logs, while others, perched atop pedestals of softer …
What are Nodules and Concretions? - stonemania.co.uk
The most important difference between a concretion and a nodule is concretions are formed from mineral precipitation around a formation of matter (a substance that has mass and takes up space). A nodule is a self-contained mass or lump …
Concretions and Nodules | Department of Mineral
Nodules are hard bodies of rock similar to concretions, though of different composition than the sediments that contain them. The term nodule derives from the Latin nodulus, a diminutive of nodus, meaning knot.
Concretions: What Are These Bizarre Rock Formations? (And …
See more on rockseeker.comA concretion is a hard mass found within layers of sedimentary stone. They’re generally round in shape, and each type tends towards one form or another. You shouldn’t confuse a concretion with a nodule. Nodules occur as minerals different from the surrounding layers, while concretions are largely composed …What’s the difference between a concretion and a nodule
Jul 29, 2022 · A concretion is a collection of hardened compacted matter that forms as a result of mineral precipitation in spaces between the particles. In mineralogy a nodule is a small …
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Geodes vs. Thundereggs, Nodules, Concretions, and …
Apr 28, 2024 · Concretion differs from geodes as they aren’t hollow towards their core. Also, they form and grow from their cores outwards, not inwardly. Also, most nodules are non-crystalline, i.e., they don’t have crystals inside like geodes.
Iron-oxide concretions and nodules 1 | Some …
Iron-oxide concretions, iron-oxide nodules, and ironstones are often mistaken for meteorites because they are heavy (dense) and their unusual (frequently bizarre!) shapes catch people’s attention. Hematite concretions form by precipitation of …
Septarian Nodules: Beginners Guide to Valuing and …
Mar 28, 2023 · Septarian nodules are a type of concretion. Mudstone combines with calcite or another carbonate-rich mineral, and the calcite follows the pattern of radiating cracks that grow during the stone’s formation.
Concretions Picture Gallery - ThoughtCo
Aug 24, 2017 · A concretion consists of the same material as the rock around it, plus the cementing mineral, whereas a nodule (like flint nodules in limestone) is composed of different material. Concretions can be shaped like cylinders, …
Concretions, Or Nodules - ChestofBooks.com
Concretions, Or Nodules, are developed after the formation of strata. They are balls or irregular lumps of a material differing from that of the stratum in which they occur.
Concretions - Paleontological Research Institution
Apr 3, 2020 · Concretions form inside sediments before they harden into rocks, when they are still soft, as minerals within a sediment precipitate, sometimes in successive layers around a …
Are concretions valuable? – Heimduo
What is the difference between a concretion and a nodule? A concretion consists of the same material as the rock around it, plus the cementing mineral, whereas a nodule (like flint nodules …
Nodules - Questions & Answers - The Fossil Forum
Oct 24, 2011 · A nodule is a generally oval or rounded off shape, of rather homogeneous material. If it is "full", we call it nodule ; if it has a cavity with crystals, we call it geode. A concretion is the …
Nodule | Igneous, Sedimentary & Metamorphic | Britannica
nodule, rounded mineral concretion that is distinct from, and may be separated from, the formation in which it occurs. Nodules commonly are elongate with a knobby irregular surface; they …
Some people ask what the difference is between a concretion and a nodule. Although they may look similar, a nodule can be any material and is often volcanic in origin. A nodule is a lump, …
Septarian Concretion: What Is It and Characteristics
There is an important distinction to draw between concretions and nodules. Concretions are formed from mineral precipitation around some kind of nucleus while a nodule is a …
8.2: Diagenetic Structures - Geosciences LibreTexts
Nodules are similar to concretions, except that they are internally massive. Distinctive types include: Bauxites and laterites – nodular soils composed of iron- and alumina-rich minerals …
How To Identify A Nodule Geology | Science-Atlas.com
Jun 15, 2022 · Concretions are cemented bodies of sediment that are found in sedimentary rock or soil and mostly spherical in shape. Concretions are difficult physiques that form in …
What is a Geode? How Do Geodes Form? – Unearthed Store
What is the Difference Between a Geode and a Concretion? While both Geodes and Concretions are hard rounded masses with minerals and crystals inside, they form in different ways. …
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