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What rock contains 40 percent potassium feldspar 35 percent quartz 12 percent plagioclase feldspar 8 percent biotite and 5 percent amphobole?
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∙ 12y ago
Rhyolite
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∙ 12y ago
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What element makes up feldspar?
It depends on the type of feldspar. Potassium Feldspar (also called K-Spar), contains potassium, aluminum, silicate: KAlSi3O8. Plagioclase Feldspar, on the other hand, contains calcium or sodium, aluminum, and silicate: NaAlSi3O8 or CaAl2Si2O8.
What type of cleavage does feldspar have?
Plagioclase feldspar is a non-metallic mineral. It has 2 cleavages at nearly right angles. It is also differentiated from potassium feldspar because it contains striations. Potassium feldspar has 2 cleavages at nearly right angles.
What are two feldspars found in granite?
Granite contains plagioclase feldspar and potassium feldspar. It really depends on the composition of the magma from which it forms. If the granite has a lot of pink in it, chances are it is potassium feldspar (K-Spar). If it is dominated by white, then the feldspar is probably plag.
How is plagioclase used?
Plagioclase feldspar is used most commonly in ceramics, glass, enamel, soap, false teeth, and scouring powders. Another form of feldspar, potassium feldspar, has very similar uses.
The dating method that can be used in some cases on rocks as young as 50000 years old that contain feldspar mica or amphobole is?
potassium-argon
What is granodiorite?
Granodiorite is an intrusive igneous rock. Its composition is similar to that of granite but it contains more plagioclase than potassium feldspar. Biotite and hornblende are also abundant minerals in granodiorite.
What minerals are in granite but not gabbro?
Granite contains Quartz and Plagioclase Feldspar and Gabbro does not have neither if these minerals in it.
What igneous rock contains mostly plagioclase feldspar and about 30 percent dark silicates?
A Diorite.
What rock contains both amphibole and potassium feldspar?
Granite is a rock containing both amphibole and potassium feldspar.
What are the ten most rock- forming minerals?
Quartz, Potassium Feldspar, Plagioclase Feldspar, Muscovite (mica), Biotite (mica), Amphibole (hornblende), Pyroxene, Olivine, Calcite, Dolomite.
Definitions for basaltic composition?
a compositional group of igneous rocks indicating that the rock contains substantial dark silicate minerals and calsiumrich plagioclase feldspar. a compositional group of igneous rocks indicating that the rock contains substantial dark silicate minerals and calsiumrich plagioclase feldspar.
Which is the dominant feldspar in basalt?
Plagioclase
