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Quartz and potassium feldspar grains are the main constituents of which rock?
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∙ 14y ago
Felsic igneous rock, like granite.
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∙ 14y ago
Wiki User
∙ 11y agoGranite
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Why does an arkose sandstone have more angular grains than a quartz?
The angular grains are probably due to the high feldspar content of the arkose rock. Unweathered feldspar from granite, the source rock of arkose, would be composed of crystals with sharply defined cleavage planes, and would have formed a more euhedral crystal shape compared to the rounded quartz grains that are present in quartz sandstones.
What are the minerals in a sandstone rock?
Sandstone is a sedimentary rock formed when grains of sand are deposited and subsequently compacted into rock by the pressure of overlying deposits and by the cementing effect of various other chemicals. The minerals found in sandstone will be whatever minerals were in the original grains of sand that formed the rock, chiefly quartz, and usually feldspar. Any number of other trace minerals will be found, depending upon the original source of the sand. The minerals that cement the sand particles together with likely be calcium carbonate, calcite, and silica. Check out wikipedia for more detail: http://en.wikipedia.org/wiki/Sandstone Rod Burrows, PE
How would you distinguish among granite gabbro and diorite?
Gabbros is formed of course grained ferromagnesian minerals and gray plagioclase feldspar it can be identified on the basis of cleavage and with practice verifies that no quartz is present. Diorite is composed of feldspar and significant amounts of ferromagnesian minerals. The mineral can be identified and their percentages estimated to indicate diorite. Granite is a coarse grained (the grains are larger than 1 millimeter) rock composed of predominantly of feldspar and quartz, is an intrusive rock.
Is quartz found in granite?
Quartz will probably be found in most igneous and metamorphic rocks. Granite is a classic example of a rock with quartz in it. Search for images of "granite." Quartz sandstone is another rock practically made entirely up of quartz.
Is siltstone organic?
No, silt contains quartz and feldspar and is inorganic
Why does an arkose sandstone have more angular grains than a quartz?
The angular grains are probably due to the high feldspar content of the arkose rock. Unweathered feldspar from granite, the source rock of arkose, would be composed of crystals with sharply defined cleavage planes, and would have formed a more euhedral crystal shape compared to the rounded quartz grains that are present in quartz sandstones.
What is the principal mineral in sandstone?
Sandstone is a type of clastic sedimentary rock with sand-sized minerals or sand grains. Its two chief minerals are quartz and feldspar.
Sedimentary rock compossed of small grains of sand and quartz and feldspar?
This is the definition of the sedimentary rock shale.
What are standstones made of?
Sandstones are made out of sand sized particles or rock grains. Sandstones are clastic sedimentary rock. Some sandstone is composed of feldspar or quartz.
What pair of minerals most common in detrital sedimentary rocks?
Clay minerals and quartz are the chief constituents of most sedimentary rocks in this category. To answer why, clay minerals are the most abundant product of the chemical weathering of silicate minerals, especially the feldspars. Clays are fine-grained minerals with sheetlike crystalline structures similar to the micas. Quartz is abundant because it is extremely durable and very resistant to chemical weathering. Thus, when igneous rocks such as granite are attacked by weathering processes, individual quartz grains are freed.
What sedimentary rock composes of small grains of sand?
Sandstone is a sedimentary rock mainly composed of small sand size grains of quartz and/or feldspar. It is often used for construction and also to make items used in the house.
What Sedimentary rock is composed of of small grains of sand?
Sandstone is a sedimentary rock mainly composed of small sand size grains of quartz and/or feldspar. It is often used for construction and also to make items used in the house.
What are the minerals in a sandstone rock?
Sandstone is a sedimentary rock formed when grains of sand are deposited and subsequently compacted into rock by the pressure of overlying deposits and by the cementing effect of various other chemicals. The minerals found in sandstone will be whatever minerals were in the original grains of sand that formed the rock, chiefly quartz, and usually feldspar. Any number of other trace minerals will be found, depending upon the original source of the sand. The minerals that cement the sand particles together with likely be calcium carbonate, calcite, and silica. Check out wikipedia for more detail: http://en.wikipedia.org/wiki/Sandstone Rod Burrows, PE
What has quartz in it?
Most sand grains are of quartz.
What is made of rocks?
Rocks are made of grains that fit together.
What is the difference between sandstone and limestone in terms of where they came from?
Sandstone is made chiefly of quartz or feldspar grains, and limestone of calcium carbonate grains. Sand grains are usually formed by the erosion of older rocks. Calcium carbonate grains may be formed by the evaporation of sea water, or by the deposition of the exoskeletons of sea creatures.
How would you distinguish among granite gabbro and diorite?
Gabbros is formed of course grained ferromagnesian minerals and gray plagioclase feldspar it can be identified on the basis of cleavage and with practice verifies that no quartz is present. Diorite is composed of feldspar and significant amounts of ferromagnesian minerals. The mineral can be identified and their percentages estimated to indicate diorite. Granite is a coarse grained (the grains are larger than 1 millimeter) rock composed of predominantly of feldspar and quartz, is an intrusive rock.
