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Concretions. A concretion is a hard, compact mass of matter 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, although irregular shapes also occur. The word 'concretion' is derived from the Latin concretio " (act of ...
- What Is A Concretion?
- How Are Concretions formed?
- What’s Inside A Concretion?
- Types of Concretion and Their Contents
- Should I Open My Concretion?
A 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 of the same sediment as that which formed t...
Concretions are formed through the precipitation of minerals in sediment before it hardens. Essentially, they became mineralized before the rest of the surrounding rock. Concretions form early on in the sedimentary stone cycle if they’re present. Remember that a sedimentary stone is comprised of a mass of sediment, such as sand or clay, that’s been...
What’s inside depends on the type of concretion. As a general rule, those that were formed by concentric growth should have something in the center. Those which are pervasivein growth will often simply be harder than the surrounding rocks. For fossil hunters, concretions are always an exciting opportunity. Some may contain fossils in the center, an...
There are hundreds of different concretion types around the world, each unique to the area that they’re from. That said, there are also some broad types that are more commonly seen. Let’s take a look at some of them.
Many rockhounds have a concretion around somewhere, whether they brought it home knowingly or unknowingly. Opening them up can be a controversial affair, but in the end it’s going to boil down to the person involved. While some concretions may contain fossils, not all do. That can make it a bit of a gamble if you choose to open them up and like the...
Marlstone aggregate concretion, Sault Ste. Marie, Michigan, United States. A concretion is a hard, compact mass formed by the precipitation of mineral cement within the spaces between particles, and is found in sedimentary rock or soil. [1] Concretions are often ovoid or spherical in shape, although irregular shapes also occur.
A concretion is a hard mass that forms when rock minerals precipitate in cracks or cavities, or through the build-up of sediment. These mineral masses are common in types of sedimentary rock, such as sandstone, which is made up of compacted grains of sand, limestone, which is composed of calcium carbonate, shale, which is composed of compressed ...
Apr 3, 2020 · The size of the concretion may be related to the permeability of the rock in which it occurs: the more permeable the surrounding rock, the larger the concretion. Below we introduce the major types of concretions and similar rocks, as well as share images of concretions that were sent to us by the public and often initially mistaken for various types of fossils.
- Paleontological Research Institution
Concretions can have regular shapes like blocks, boxes, pipes, flat discs, canon balls, or even resemble parts of a human body such as a foot or rib. It is sometimes hard to believe that they formed by natural processes. Ironstone concretions are common around Sydney, with its outcrops of iron-rich shale and sandstone.
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concretion, mass or nodule of mineral matter, usually oval or nearly spherical in shape, and occurring in sedimentary rock. It is formed by the accumulation of mineral matter in the pore spaces of the sediment, usually around a fossil or fossil fragment acting as a nucleus.
