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Coarse Grained (phaneritic): Medium rate of cooling occurs under the surface resulting in a homogenous mix of visible crystals. Few crystals will grow at medium rates until they run into each other in the solidifying magma. Example: granite.
Fine Grained (aphanitic): Quicker cooling at or near the surface results in a higher crystal nucleation rate with high growth rate. Because of the number of crystals being formed, they will run into each other in the solidifying magma before substantial growth takes place, resulting in small grain size. The size of the crystals will not be visible to the naked eye. Example: basalt.
Glassy (holohyaline): An extremely quick cooling results in a low growth and nucleation rate, restricting the amount of crystal formation, and resulting in a glassy texture. Usually the result of lava contact with water or from becoming airborne upon eruption. Example: obsidian.
Large grains surrounded by small grains (porphyritic): The normal result of two stage cooling; larger crystals develop underground from the magma, then the magma is cooled quickly by exposure to the surface through eruption.
The amount of time taken for the rock to cool from a liquid state.
Wiki User
∙ 12y ago
Wiki User
∙ 9y agoClastic rocks are composed of broken pieces of rocks of varying sizes. The broken pieces of varying sizes are transformed through a process called cementation to form clastic rocks.
Wiki User
∙ 13y agoIt supplies information about the depositional setting and the distance the sediments traveled before deposition.
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What is the clasts is controlled by the ablity of a carrier to move them?
Size
What is rock texture?
Texture refers to the size and orientation of the mineral crystals or clasts contained within the rock.
What are the small pieces that rocks are made from called?
Grains, clasts, or detritus.
Which rock type is associated with a high-energy environment such as a very turbulent stream?
If the rock formed in a turbulent stream then it would probably be called a conglomerate. These have well rounded clasts because the water has worn them down, as well as a large variation in the size of the clasts which is due to the high energy environment. If the rock formed in another high energy situation, such as a landslide, it could be called a breccia. It is a similar type of sedimentary rock to a conglomerate, however, its clasts are very angular rather than rounded because they are usually fragments of other rocks which have been broken during the high energy event.
Rocks that have layers or clasts were formed by what?
Is it sediment being compressed until it becomes rock
What are rock or mineral fragments called?
Clasts. An accumulation of fallen clasts at the bottom of a rock face is "scree". An accumulation of clasts generally, up to about cobble size anyway, is a "sediment".
What is the clasts is controlled by the ablity of a carrier to move them?
Size
What is true about the texture of all detrital sedimentary rocks?
Clastic rocks have a 'clastic texture', which means they consist of clasts. The 3D orientation of these clasts is called the fabric of the rock. Between the clasts the rock can be composed of a matrix or a cement (the latter can consist of crystals of one or more precipitated minerals). The size and form of clasts can be used to determine the velocity and direction of current in the sedimentary environment where the rock was formed; fine, calcareous mud only settles in quiet water, while gravel and larger clasts are only deposited by rapidly moving water.[10][11] The grain size of a rock is usually expressed with the Wentworth scale, though alternative scales are used sometimes. The grain size can be expressed as a diameter or a volume, and is always an average value - a rock is composed of clasts with different sizes. The statistical distribution of grain sizes is different for different rock types and is described in a property called the sorting of the rock. When all clasts are more or less of the same size, the rock is called 'well-sorted', when there is a large spread in grain size, the rock is called 'poorly sorted'
What is rock texture?
Texture refers to the size and orientation of the mineral crystals or clasts contained within the rock.
What is the grain size of breccia?
Randomly sized angular clasts in a finer-grained cementing matrix.
Does rounding tell about how much or how many?
It can tell you approximately how much or how many.
Why aren't rocks classified by their size?
Any rock could be virtually any size, so it would be of little use to use size as a classification parameter. Sediments or clasts composing sedimentary rocks, however, are classified according to size.
What are the small particles or the remain of living things that make up a sedimentary rock called?
They are referred to as clasts or bio-clasts.
The Small particles of rock or the remains of living things that make up sedimentary rocks are what?
They are referred to as clasts or bio-clasts.
Grains of rock larger than sand are called what?
Gravel, cobbles and boulders are all individual clasts of increasing size that are larger than sand.
What is another name for clasts?
Klastos
How can tell if a rifle has been reblued?
Check the stampings for buffing or rounding.
