Diorite
You would expect to find plagioclase feldspar in a greater variety of igneous rocks compared to biotite. Plagioclase feldspar is a more common mineral and is found in both mafic and felsic rocks, while biotite is typically found in intermediate to felsic rocks.
Syenite is primarily composed of alkali feldspar minerals such as orthoclase and plagioclase feldspar, along with small amounts of other minerals such as quartz, hornblende, and mica. It lacks significant amounts of calcium-rich plagioclase feldspar, which distinguishes it from 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.
Andesite and diorite are two common igneous rocks that have a mineral composition intermediate between granitic and basaltic rocks. Andesite is fine-grained and contains plagioclase feldspar and pyroxene minerals, while diorite is coarse-grained and composed of plagioclase feldspar, amphibole, and other minerals.
Diabase is a mafic, fine-grained igneous rock composed mostly of plagioclase feldspar and pyroxene. Diorite is also an igneous rock, but it is intermediate in composition between mafic and felsic, consisting mainly of plagioclase feldspar and amphibole. The main difference lies in their mineral compositions, with diabase containing more pyroxene and diorite containing more amphibole.
The minerals that form diorite include plagioclase feldspar, biotite, and hornblende. Andesite is primarily composed of plagioclase feldspar, pyroxene, and hornblende. Both rocks are intermediate in composition between granite and basalt.
No. The chemical formula of Plagioclase feldspar is (Na,Ca)(Si,Al)4O8
Felsic rocks are typically composed of minerals such as quartz, potassium feldspar, plagioclase feldspar, and muscovite mica. These minerals are light in color and have lower densities compared to mafic rocks.
You would expect to find plagioclase feldspar in a greater variety of igneous rocks compared to biotite. Plagioclase feldspar is a more common mineral and is found in both mafic and felsic rocks, while biotite is typically found in intermediate to felsic rocks.
Syenite is primarily composed of alkali feldspar minerals such as orthoclase and plagioclase feldspar, along with small amounts of other minerals such as quartz, hornblende, and mica. It lacks significant amounts of calcium-rich plagioclase feldspar, which distinguishes it from 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.
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.
Andesite and diorite are two common igneous rocks that have a mineral composition intermediate between granitic and basaltic rocks. Andesite is fine-grained and contains plagioclase feldspar and pyroxene minerals, while diorite is coarse-grained and composed of plagioclase feldspar, amphibole, and other minerals.
Diabase is a mafic, fine-grained igneous rock composed mostly of plagioclase feldspar and pyroxene. Diorite is also an igneous rock, but it is intermediate in composition between mafic and felsic, consisting mainly of plagioclase feldspar and amphibole. The main difference lies in their mineral compositions, with diabase containing more pyroxene and diorite containing more amphibole.
The four minerals that make up rocks in the intermediate family are plagioclase feldspar, amphibole (such as hornblende), biotite, and quartz. These minerals are typically found in rocks like diorite and andesite, which have a composition between felsic and mafic rocks.
Granodiorite is a phaneritic, intrusive igneous rock composed primarily of plagioclase feldspar, quartz, and one or more mafic minerals such as biotite or hornblende. It has a composition intermediate between granite and diorite.
Sandstone will often contain feldspar, but some sandstones are composed entirely of quartz.