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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.


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 the types of feldspar?

The two main types of feldspar are potassium feldspar (orthoclase) and plagioclase feldspar. Potassium feldspar contains high levels of potassium, while plagioclase feldspar contains a mixture of sodium and calcium. Both types are commonly found in igneous rocks and have different colors and compositions.


How feldspars differ from one another?

Feldspars are classified based on their chemical composition into three main groups: potassium feldspar, plagioclase feldspar, and sodium feldspar. Potassium feldspar includes orthoclase and microcline, while plagioclase feldspar includes albite, oligoclase, and labradorite. Sodium feldspar primarily consists of albite. Each type of feldspar has a unique mineral structure and varying ratios of sodium, potassium, and calcium ions.


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 minerals does the rock granite always contain?

Granite always contains the minerals quartz, feldspar (potassium feldspar or plagioclase feldspar), and mica (biotite or muscovite). These minerals give granite its characteristic appearance and properties.


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.


Which minerals are found in basalt and gabbro?

Basalt contains minerals such as plagioclase feldspar, pyroxene, and olivine. Gabbro also contains plagioclase feldspar and pyroxene, but generally has a coarser texture due to slower cooling rates underground.


Is Basalt contains the greatest quantity of which mineral?

Basalt contains the greatest quantity of the mineral plagioclase feldspar.


What rock contains both amphibole and potassium feldspar?

Granite is a rock containing both amphibole and potassium feldspar.


What igneous rock contains mostly plagioclase feldspar and about 30 percent dark silicates?

A Diorite.


What are the ten most rock- forming minerals?

Quartz, Potassium Feldspar, Plagioclase Feldspar, Muscovite (mica), Biotite (mica), Amphibole (hornblende), Pyroxene, Olivine, Calcite, Dolomite.