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is a variety of sandstone generally characterized by its hardness, dark color, and poorly-sorted, angular grains of quartz, feldspar, and small rock fragments or lithic fragments set in a compact, clay-fine matrix.
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∙ 14y ago
Wiki User
∙ 12y agoGreywacke or graywacke, is a coarse sandstone, which is included in the sedimentary rock group.
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What metamorphic rock is formed from greywacke?
Hornfels or gneiss are possible metamorphic rock with a greywacke protolith.
Why is air less dense than Earth's rocks?
Magma is less dense because it is a fluid, is hot, and it is full of gases. Ultimately a volcano is an expression of the lightest minerals in a magma, mixed with volatile gases. It is true that molten rock takes up more space than cold rock, because the ions involved are in a greater state of excitement. Heat rises, and as it rises it takes with it the molten magma, but as it rises it also loses heat, thereby dropping higher melting point minerals out of solution. If magma is less dense than the surrounding rock it will rise, according to the physical laws of gravity. Magma finds its own level, where it is in density equilibrium with its surrounding rocks. Fractionation can occur within the magma body, where the heavy minerals created will crystallize and sink within the body, and the lighter fluid will rise until it finds another density equilibrium. Magma created in subduction zones generally contains more volatile gases than other knids of magma because a lot of water has been incorporated within the subducting slab as zeolites. This reduces the melting point of the magma. Aso, from a slight;y different perspective, there is an interchange between granite and its surrounding greywacke, both are very similar in density, and in the vicinity of a felsic orogeny bits of granite can be found in greywacke, and bits of greywacke (xenoliths) can be found in granite .
How is greywacke different from scoria?
They are two very different rocks. Graywacke is a clastic sedimentary rock, specifically a type of sandstone. It is composed of sand-sized grains of quartz, felspar, and other rock particles with a matrix of silt and clay. Scoria is an extrusive igneous rock characterized by a dark color and holes called vesicles. It is similar to pumice, though denser. It is formed when a volcano explosively ejects lava. Gas bubbles form in the lava and are locked in place when it cools into a rock.
What sedimentary rock turns into epidosite?
Sedimentay rocks like greywacke of arkose, in presence of high fluid-rock ratio, can be converted to epidosite. The feldspars present in these rocks are altered to epidote & these rocks contain already quartz which together form epidosites. Epidosites also occur as part of metasomatic skern association. sedimentary dolomite associated with ultramafics often show contact zone metasomatism, in which Ca- minerals are often altered into epidote. Quartz is produced as by products in the reactions.
How igneous rock can become sedimentary rocks?
An igneous rock at the earth's surface was once a long way under the earth in a magma chamber. Often the expression at the surface was a volcano, spewing out volcanic rock. The term for such activities on a large scale is called an orogeny. As time has gone by, there will have been uplift of the earth due to compression of the tectonic plates (there may have been many other geological activities in the meantime). During uplift there will be erosion due to weathering and tectonic activity. Eventually the magma chamber becomes exposed at the surface. these chambers can be very extensive, covering many hundreds of kilometres. The igneous rock inside the chambers are subject to the same weathering forces as the strata above them, once exposed. The rock breaks down (erodes), and tumbles due to gravity, to the lowest point possible, usually low areas of the ocean, off the continental shelves (but not always). Here it sits and becomes compacted with time due to accumulation of sediment above it, and often lowering due to tensions (pulling apart) of the tectonic plates.. As time goes by there will be another phase of uplift (among other geological activities that occur with time) and the result is a sedimentary rock exposed at the surface, with an igneous signature, usually called greywacke or sandstone. The different layers (strata) of the rock tell a story of the history of the rock. Geochemical analysis can pinpoint closely where the rock originated before being turned into a sedimentary rock. Fossils can provide relative dates of when the sedimentary rock was created, and radiometric dating can give accurate dates of when both the sedimentary and the igneous rock was created.
What is the rock-sub category for a Greywacke rock?
Lithic greywacke comprises more lithic fragments and feldspathic greywacke contains more feldspar
What metamorphic rock is formed from greywacke?
Hornfels or gneiss are possible metamorphic rock with a greywacke protolith.
Is graywacke a sedimentary rock?
yes, graywacke is a sedimentary rock
What type of stone was angkor what made from?
Sandstone, there were 3 types found: yellow-brown sandstone, red sandstone, and greywacke (which is a hard sandstone)
When was king menkaure and his queen sculpture made?
the ancient Egyptian sculpture king menkaure and his gueen is made out of greywacke.
How does mount cook compare to mount kosciusko?
Mount Cook/ Aoraki, New Zealand, is 3765m tall, and is of greywacke composition. Mount Kosciusko, Australia, is 2231m tall, and is an extinct volcano.
What are some nine letter words with 5th letter W and 6th letter A and 9th letter E?
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 6 words with the pattern ----WA--E. That is, nine letter words with 5th letter W and 6th letter A and 9th letter E. In alphabetical order, they are: allowable allowance graywacke greywacke renewable screwable
What are some nine letter words with 4th letter Y and 5th letter W and 6th letter A and 9th letter E?
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern ---YWA--E. That is, nine letter words with 4th letter Y and 5th letter W and 6th letter A and 9th letter E. In alphabetical order, they are: graywacke greywacke
What are some nine letter words with 3rd letter E and 7th letter C and 9th letter E?
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 5 words with the pattern --E---C-E. That is, nine letter words with 3rd letter E and 7th letter C and 9th letter E. In alphabetical order, they are: bretasche crepuscle exercycle greywacke spectacle
What are some nine letter words with 1st letter G and 4th letter Y and 6th letter A and 8th letter K?
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 4 words with the pattern G--Y-A-K-. That is, nine letter words with 1st letter G and 4th letter Y and 6th letter A and 8th letter K. In alphabetical order, they are: graybacks graywacke greybacks greywacke
What are some nine letter words with 2nd letter R and 3rd letter E and 4th letter Y and 9th letter E?
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern -REY----E. That is, nine letter words with 2nd letter R and 3rd letter E and 4th letter Y and 9th letter E. In alphabetical order, they are: greystone greywacke
What are some nine letter words with 1st letter G and 5th letter W and 7th letter C and 9th letter E?
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern G---W-C-E. That is, nine letter words with 1st letter G and 5th letter W and 7th letter C and 9th letter E. In alphabetical order, they are: graywacke greywacke
