can sedimentary rocks have crystals
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-    Sedimentary rocks can also be formed when minerals are dissolved in  water and are then resolidified. This type of sedimentary rock is  called a chemical sedimentary rock. Oolitic limestone is a good  example of this type of sedimentary rock.here is a group of sedimentary rocks called evaporites that include crystals of salt, gypsum, sylvite, glauberite, thenardite, mirabilite and a few others. However, there is a tremendous variety of other minerals that can produce crystals in sedimentary rocks.
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- Sedimentary rocks form from sediment. Sediment is a general term that indicates loose grains (such as the sand at the beach) and chemical precipitates (such as crystals of salt). Sedimentary rocks can be subdivided in three categories: clastic, chemical, and biochemical sedimentary rocks.
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- A sedimentary rock is a rock formed at or near the Earth's surface by the accumulation and lithification of fragments of preexisting rocks or by precipitation from solution at … normal surface temperatures.t is a question of definition. Rocks are defined to be composed of minerals (at least two minerals). Minerals are by definition solid because liquid materials cannot sustain … a regular repeated and symmetrical crystal lattice. Therefore rocks have to be solid.
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Sedimentary rocks This is called compaction. The water is squeezed out from between the pieces of rock and crystals of different salts form. The crystals form a sort of glue that sticks or cements the pieces of rock together. This process is called cementation. These processes eventually make a type of rock called sedimentary rock. It may take millions of years for sedimentary rocks to form.
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- Medium-grained rocks can be composed of quartz grains, feldspar grains (arkose), or rock fragments and clay (graywacke). Sandstone (Photograph by Parvinder Sethi). Medium-sized grains in clastic sedimentary rocks form sandstone. This sample is a quartz sandstone.
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Sedimentary rock Most sedimentary rocks contain either quartz (especially siliciclastic rocks) or calcite (especially carbonate rocks). In contrast to igneous and metamorphic rocks, a sedimentary rock usually contains very few different major minerals.lastic sedimentary rocks are composed of silicate minerals and rock fragments that were transported by moving fluids (as bed load, suspended load, or by sediment gravity flows) and were deposited when these fluids came to rest.
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- Granite has large crystals. If the magma cools slowly, large crystals form in the rock. This can happen if the magma cools deep underground. Granite and gabbro are examples of this type of rock. They are intrusive igneous rocks because they form from magma underground.Unlike sedimentary rocks, igneous rocks do not contain any fossils. This is because any fossils in the original rock will have melted when the magma formed. 1  Page. 2  1.3  2.ranite and gabbro are examples of this type of rock. They are intrusive igneous rocks because they form from magma underground. Unlike sedimentary rocks, igneous rocks do not contain any fossils. This is because any fossils in the original rock will have melted when the magma formed. 1  Page. 2  1. 3  2.
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3.3 Crystallization of Magma Granite has large crystals. If the magma cools slowly, large crystals form in the rock. This can happen if the magma cools deep underground. Granite and gabbro are examples of this type of rock. They are intrusive igneous rocks because they form from magma underground. Unlike sedimentary rocks, igneous rocks do not contain any fossils.
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- Sedimentary rocks Chemical sedimentary rocks form when mineralsprecipitate from a solution, usually sea water. Halite andgypsum are examples of minerals that precipitate fromaqueous solutions to form chemical sedimentary rocks. Biochemical sedimentary rocks are composed ofaccumulations of organic debris.
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- The most common clastic sedimentary rocks are breccia and conglomerate (formed from gravel), sandstone (from sand), siltstone (from silt), and shale (from clay). B. CHEMICAL SEDIMENTARY ROCKS. Chemical sedimentary rocks are crystalline, that is made of crystals interlocked with each other.lastic sedimentary rocks form when individual grains (the sediment), made by fragments of rocks, minerals, or shells, are cemented together (the clastic sediemntary rock). These are the only type of rock that is NOT made simply of crystals, but rather fragments of other materials, broken and then reassembled together.
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Sedimentary rock Among the three major types of rock, fossils are most commonly found in sedimentary rock. Unlike most igneous and metamorphic rocks, sedimentary rocks form at temperatures and pressures that do not destroy fossil remnants.lastic sedimentary rocks are composed of silicate minerals and rock fragments that were transported by moving fluids (as bed load, suspended load, or by sediment gravity flows) and were deposited when these fluids came to rest.
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- Chemical sedimentary rocks are a different type of sedimentary rock because they are not made up of weathered sediment grains; instead they are composed of mineral crystals that form out of solution.In other words, chemical sedimentary rocks contain crystals and other elements that have been dissolved out of water.etrital or clastic sedimentary rocks are composed of rock fragments. They are different than chemical sedimentary rocks, which are composed of mineral crystals. Learn how these sedimentary rocks differ in their formation and composition.
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Sedimentary Rock Clastic sedimentary rocks are formed from particles of pre-existing sedimentary, metamorphic, or igneous rock that are deposited, compacted, and cemented together by natural processes. Clastic sedimentary rock is made of fragments of rocks cemented together by a mineral such as calcite or quartz.
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Gemstone Origins Examples of sedimentary rocks include limestone, shale, and sandstone. Examples of gemstone materials that are sedimentary in origin are jet, aragonite and calcite. Surprisingly, most gemstones are found in sedimentary deposits after they have been weathered out of their original parent rock. These gem materials, discovered in river sediments, called alluvial deposits, include gems such as diamond, spinel, sapphire, and ruby.
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3.3 Crystallization of Magma If the magma cools slowly, large crystals form in the rock. This can happen if the magma cools deep underground. Granite and gabbro are examples of this type of rock. They are intrusive igneous rocks because they form from magma underground. Unlike sedimentary rocks, igneous rocks do not contain any fossils. This is because any fossils in the original rock will have melted when the magma formed. 1  Page. 2  1. 3  2. 4  3.
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- Chemical sedimentary rocks are a different type of sedimentary rock because they are not made up of weathered sediment grains; instead they are composed of mineral crystals that form out of solution.
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Sedimentary rock Sedimentary rocks are formed when sediment is deposited out of air, ice, wind, gravity, or water flows carrying the particles in suspension. This sediment is often formed when weathering and erosion break down a rock into loose material in a source area.lastic sedimentary rocks are composed of silicate minerals and rock fragments that were transported by moving fluids (as bed load, suspended load, or by sediment gravity flows) and were deposited when these fluids came to rest.
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- Granite has large crystals. If the magma cools slowly, large crystals form in the rock. This can happen if the magma cools deep underground. Granite and gabbro are examples of this type of rock. They are intrusive igneous rocks because they form from magma underground. Unlike sedimentary rocks, igneous rocks do not contain any fossils. This is because any fossils in the original rock will have melted when the magma formed. 1  Page. 2  1. 3  2. 4  3. 5  4.
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Sedimentary rocks This is called compaction. The water is squeezed out from between the pieces of rock and crystals of different salts form. The crystals form a sort of glue that sticks or cements the pieces of rock together. This process is called cementation. These processes eventually make a type of rock called sedimentary rock.It may take millions of years for sedimentary rocks to form.his is called compaction. The water is squeezed out from between the pieces of rock and crystals of different salts form. The crystals form a sort of glue that sticks or cements the pieces of rock together. This process is called cementation. These processes eventually make a type of rock called sedimentary rock.
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Geology Anthology Sedimentary rocks are formed particle by particle and bed by bed, and the layers are piled one on top of the other. Thus, in any sequence of layered rocks, a given bed must be older than any bed on top of it.ravel becomes a rock called conglomerate, sand becomes sandstone, mud becomes mudstone or shale, and the animal skeletons and plant pieces can become fossils. An idealized view of a modern landscape and some of the plants and animals that could be preserved as fossils.
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Desert rose (crystal) The rosette crystal habit tends to occur when the crystals form in arid sandy conditions, such as the evaporation of a shallow salt basin. The crystals form a circular array of flat plates, giving the rock a shape similar to a rose blossom. Gypsum roses usually have better defined, sharper edges than baryte roses. Celestine and other bladed evaporite minerals may also form rosette clusters. They can appear either as a single rose-like bloom or as clusters of blooms, with most sizes ranging from pea sized to 4 inches (10 cm) in diameter.
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About Sedimentary Rocks Clastic Sedimentary Rocks. The most common set of sedimentary rocks consist of the granular materials that occur in sediment. Sediment mostly consists of surface minerals —quartz and clays—that are made by the physical breakdown and chemical alteration of rocks.f gravel or pebbles are part of the sediment, the rock that forms is conglomerate. If the rock is broken and recemented together it is called breccia. See examples of all these in the Sedimentary Rock Index. It's worth noting that some rocks commonly lumped in the igneous category are actually sedimentary.
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Pictures of Sedimentary Rocks Chemical sedimentary rocks, such as rock salt, iron ore, chert, flint, some dolomites, and some limestones, form when dissolved materials precipitate from solution. Organic sedimentary rocks such as coal, some dolomites, and some limestones, form from the accumulation of plant or animal debris.Photos and brief descriptions of some common sedimentary rock types are shown on this page. Coal is an organic sedimentary rock that forms mainly from plant debris.hemical sedimentary rocks, such as rock salt, iron ore, chert, flint, some dolomites, and some limestones, form when dissolved materials precipitate from solution. Organic sedimentary rocks such as coal, some dolomites, and some limestones, form from the accumulation of plant or animal debris.
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What are the characteristics of sedimentary igneous and metamorphic rocks? Sedimentary (as in sediment) rocks are sometimes grainy, they're made when different layers of pebbles, sand and such, are all compacted together by pressure, so they usually have layers, and limestone (a sedimentary rock that dissolves in vinegar, or any type of acid) commonly contains fossils.
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Sedimentary Rocks Facts Fossils of organisms become buried over time and are often found in sedimentary rock. Sedimentary rocks are divided among three different groups based on their composition and texture. Classic sedimentary rock forms when older rocks break down and become compacted together. Examples of classic sedimentary rock include sand-stone and breccia. Sand-stone is a sedimentary rock that has been used to make housewares since prehistoric times.