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Where does topaz come from?
Topaz forms in pegmatites and high temperature quartz veins. It is deposited by fluorine-rich vapors in rocks of rhyolite composition and forms in cavities in granites and rhyolites. Brazil is the largest supplier of topaz.
What minerals would you expect to find in a sample of gabbro?
Expect to find plagioclase in most phaneritic igneous rocks and often as phenocryts in aphanitic rocks. ... You will also find quartz grains resist scratching with a nail or pocket knife, ... The answer is that in hand samples it is nearly impossible. ... rhyolites while pyroxene occurs in dark-colored rocks like gabbro and basalt).
Where is a hotspot on a volcano found?
A volcano hotspot is a region on the Earth's surface that has experienced volcanism for a long time. A good example of this is the Hawaiian Islands. Each of the islands in the long chain were created by the same volcano hot spot. The volcano built up an island that extended above the surface of the ocean, and then plate tectonics carried the island away, creating an extinct volcano. But there's always a new volcano being created by the same hot spot. There are dozens of volcano hot spots around the world, with the Hawaiian Island chain just being the most well known. Others include the Azores hotspot, the Canary hotspot and the East Australia.
How does rhyolite rock form?
Rhyolites are formed by the solidification of silicic magma on the earth surface. They are the extrusive equivalent of Granite.
What rocks have rock fragments?
It depends on what you mean by rock fragments. But, if you are referring to rocks that have bits of blown up pieces of rocks in them, aka pyroclastics, then those are volcanic breccia and tuffs. These are made up of rocks such as rhyolites, andesites, or basalts.
What rocks are felsic?
Granite, rhyolite, and pegmatite are examples of felsic rocks. These rocks are light in color and have high silica content, making them rich in minerals like quartz and feldspar. Felsic rocks are associated with continental crust and are often found in areas with volcanic activity.
What are some nine letter words with 1st letter R and 2nd letter H and 3rd letter Y and 5th letter L?
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern RHY-L----. That is, nine letter words with 1st letter R and 2nd letter H and 3rd letter Y and 5th letter L. In alphabetical order, they are: rhyolites rhyolitic
Where does topaz come from?
Topaz forms in pegmatites and high temperature quartz veins. It is deposited by fluorine-rich vapors in rocks of rhyolite composition and forms in cavities in granites and rhyolites. Brazil is the largest supplier of topaz.
What minerals would you expect to find in a sample of gabbro?
Expect to find plagioclase in most phaneritic igneous rocks and often as phenocryts in aphanitic rocks. ... You will also find quartz grains resist scratching with a nail or pocket knife, ... The answer is that in hand samples it is nearly impossible. ... rhyolites while pyroxene occurs in dark-colored rocks like gabbro and basalt).
What are some nine letter words with 1st letter R and 4th letter O and 8th letter E?
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 72 words with the pattern R--O---E-. That is, nine letter words with 1st letter R and 4th letter O and 8th letter E. In alphabetical order, they are: reboarded rebottled rebottles rebounded rebounder recolored reconquer recounted recounter recoupled recouples recoursed recourses recovered recoveree recoverer recowered redoubled redoubler redoubles redoubted redounded refocused refocuses refounded refounder rejoinder rejourned relocated relocatee relocates remodeled remodeler remoisten remolades remoulded remounted renounced renouncer renounces renovated renovates repointed reposited reposures repousses repowered resoluter resolutes resonated resonates resounded resourced resources retotaled retouched retoucher retouches rheobases rheometer rheotaxes rheotomes rhyolites ribosomes ribozymes robotised robotises robotized robotizes robotries rotovated rotovates
Can igneous rocks be found in Australia?
Yes. There are a is number of extinct volcanoes in Australia which are of course igneous, including a chain stretching from Cairns through the Glasshouse Mountains in south-eastern Queensland to Mount Napier in Western Victoria. (Formed by the Eastern Australian Hotspot.) Besides basaltic cores such as the Glasshouse Mountains, Mount Warning, etc. these produced large areas of flow basalts and rhyolites over the Atherton Tableland through the New England Tableland and so on southwards. Besides the volcanic rocks, there are intrusive adamellites at Bundaberg, Smoky Cape, and Moruya Head. Large areas of Western Australia have granitic bedrocks. The coal, iron ore, and alumina mined in Australia are all of sedimentary origin, but the silver, lead, copper, and gold mines in Mount Isa, Broken Hill, Kalgoorlie etc. are all extracted from igneous formations.
Where is a hotspot on a volcano found?
A volcano hotspot is a region on the Earth's surface that has experienced volcanism for a long time. A good example of this is the Hawaiian Islands. Each of the islands in the long chain were created by the same volcano hot spot. The volcano built up an island that extended above the surface of the ocean, and then plate tectonics carried the island away, creating an extinct volcano. But there's always a new volcano being created by the same hot spot. There are dozens of volcano hot spots around the world, with the Hawaiian Island chain just being the most well known. Others include the Azores hotspot, the Canary hotspot and the East Australia.
Is quartz sedimentary or metamorphic?
Quartz (SiO2) crystallizes from magma that is high in silica, thus most quartz is originally igneous. It then weathers out of igneous rocks as a clast and is deposited in what becomes a sedimentary rock. The original igneous rock or the quartz containing sedimentary rock can then become metamorphosed. Furthermore, quartz can also form out of solution by meteoric water or hydrothermal systems in which case it is a precipitate. It can be both crystalline or amorphous.
What materials were used at Stonehenge?
The outcrop sedimentary rocks at Stonehenge are the Late Cretaceous, Santonian Age, calcium carbonates. The outcrop sedimentary rocks comprise the first construction material used by the Stonehenge builders. This material is approximately 85 million years old. These rocks are locally called the Seaford Chalk Formation (Stonehenge White Chalk). The oldest limestone sedimentary rocks at Stonehenge are the Mississippian Period (Early Carboniferous), Arundian Age, calcium carbonates. The Mississippian Period limestone sedimentary rocks comprise the first (1st) foreign construction material used by the Stonehenge builders. This material is approximately 340 million years old. These rocks are locally called the Birnbeck Limestone Formation (Stonehenge Whitestones). The volcanic rocks (oldest geologically) at Stonehenge are the Ordovician Period intrusive igneous diabases (dolerites), and extrusive igneous felsites (rhyolites) and tuffs (basic). The Ordovician Period igneous rocks comprise the second (2nd) foreign construction material used by the Stonehenge builders. This material is approximately 470 million years old. These rocks are locally called the Ordovician Volcanics (Stonehenge Bluestones). The oldest sandstone sedimentary rocks at Stonehenge are the Silurian and Devonian Period micaceous sandstones. The Silurian and Devonian Period sedimentary sandstone rocks comprise the third (3rd) foreign construction material used by the Stonehenge builders. This material is approximately 417 million years old. These rocks are locally called the Old Red Sandstone Formation (Stonehenge Coshestons). The youngest sandstone sedimentary rocks at Stonehenge are the Oligocene and Miocene Period silicates. The Oligocene and Miocene Period sandstone sedimentary rocks comprise the fourth (4th) foreign construction material used by the Stonehenge builders. This material is approximately 24 million years old. These rocks are locally called the Reading Formation (Stonehenge Sarsens). http://www.bgs.ac.uk
What two characteristics are used to classify igneous rocks?
The first thing one would look at is if there are minerals present that are large enough to either be identified with the naked eye or with a handlense. Most lavas have large volumes of extremely finegrained material or glass whereas plutonic rocks that mostly crystallize in depths of several kilometers are usually composed of millimeter sized minerals. Further differentiation of ejecta can be done like (ash, lapilli, volcanic bombs, pahoehoe-lava etc.). One can then look at the mineralogical composition of these rocks to define whether they are basic (little silicon) like basalts/gabbros or acid (a lot of silicon) like rhyolites/granites. The usual classification is the QAPF-diagram (quarz, alkali feldspar, plagioclase, feldspathoid), which is composed of two ternary diagrams. If quarz is present the ternary diagram including quarz is used, otherwise the one with an feldspathoid endmember is chosen for classification. This field description is then usually followed by a series of lab analyses of the chemical and isotopic composition of the rock in order to be classified via their elemental composition. One example is the TAS-diagram (total alkali elements versus silicon dioxide content).
