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∙ 12y agoa group of american petrographers
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Which mineral is commonly found in the three matamorphic rocks slate schist and gneiss?
granite
Any group of hard rock forming minerals principal constituent of igneous rocks?
feldspar
What rocks does a gneiss rock contain?
Gneiss contains the minerals mica, quartz, feldspar, amphibole, garnet, and pyroxene.
How would you describe the composition of igneous rock?
There are many sorts of igneous rocks. Granite is made of quarts, feldspar, and mica, while basalts are made of less than 20% quartz and less than 10% feldspar and the rest made up of pyroxenes and olivine.
What has feldspar in it?
Feldspar can be found in many things, including soap
Potassium rich feldspar rocks?
barium
Is feldspar metamorphic igneous or sedimentary?
Feldspar is a mineral. It can be found it sedimentary and metamorphic rocks though.
What are the four major rocks?
they are quartz, mica, feldspar, and calcite.
What minerals are found in mafic rocks?
mafic rocks can be made up of orthoclase feldspar and quartz
Who discovered FELDSPAR?
Feldspar is a common mineral that makes up over 60 percent of the Earth's crust. Feldspar was first found and worn as jewelry by people in Sri Lanka.
Most silicate rocks on earths surface are?
Quartz, feldspar or mica
Name two rocks from the intermediate family?
plagioclase feldspar & hornblende
Granite is made up of the minerals feldspar and mica?
granite is made up of the minerls feldspar and mica
How do you classify igneous rocks from other types of rock?
Igneous rocks are identified by first looking at the color index. Felsic igneous rocks contain mostly potassium feldspar. Intermediate igneous rocks contain mostly plagioclase feldspar. Mafic igneous rocks contain pyroxene, olivine, and plagioclase feldspar. Ultra mafic igneous rocks contain mostly olivine. Then igneous rocks are identified based on texture. For example, the texture of igneous rocks can be aphanitic, pegmatitic, phaneritic, glassy, vesicular, etc.
Which igneous rock is composed of coarse grained crystals of quartz feldspar and mica?
Felsic igneous rocks (the lightest in color) are comprised mostly of quartz and potassium feldspar. Intermediate igneous rocks (somewhat darker than felsic) are made up of some quartz and potassium feldspar, but mostly plagioclase feldspar.
What minerals are common in both felsic and marfic igneous rocks?
Biotite and muscovite micas, quartz, magnetite, olivine, amphiboles, and feldspars.
How does arkose form?
Arkose is formed from the weathering of feldspar-rich igneous metamorphic granitic rocks. They are usually composed of quartz and feldspar called 'grus'.
