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Granite (/ ˈ ɡ r æ n ɪ t / GRAN-it) is a coarse-grained intrusive igneous rock composed mostly of quartz, alkali feldspar, and plagioclase.It forms from magma with a high content of silica and alkali metal oxides that slowly cools and solidifies underground.
Writing-on-Stone Park contains the greatest concentration of rock art on the North American Great Plains. [citation needed] There are over 50 petroglyph sites and thousands of works. The park also showcases a North-West Mounted Police (NWMP) outpost reconstructed on its original site. The original outpost was burned down by persons unknown ...
Alkali feldspar granite, some varieties of which are called 'red granite', [1] is a felsic igneous rock and a type of granite rich in the mineral potassium feldspar (K-spar). It is a dense rock with a phaneritic texture. The abundance of K-spar gives the rock a predominant pink to reddish hue; peppered with minor amounts of black minerals. [2] [3]
The Chief's "Apron" area, a massive sloping granite slab popular with rock climbers. This photo was taken from the "Malamute" This photo was taken from the "Malamute" The Apron is a vast sweep of lower-angle rock which rises like a wedge from the highway to about halfway up the Grand Wall near the Chief's approximate centre.
Monzodiorite – igneous rock An intrusive igneous rock intermediate in composition between diorite and monzonite; Monzogranite – Biotite granite rocks that are considered to be the final fractionation product of magma – A silica-undersaturated granite with <5% normative quartz
Granite rock hand-sized sample. A granitoid is a broad term referring to a diverse group of coarse-grained igneous rocks that are widely distributed across the globe, covering a significant portion of the Earth's exposed surface and constituting a large part of the continental crust. [1]
The Cornubian batholith is a large mass of granite rock, formed about 280 million years ago, which lies beneath much of Cornwall and Devon in the South West Peninsula of England. The main exposed masses of granite are seen at Dartmoor, Bodmin Moor, St Austell, Carnmenellis, Land's End and the Isles of Scilly.
Rapakivi granite is an igneous intrusive rock and variant of alkali feldspar granite. It is characterized by large, rounded crystals of orthoclase each with a rim of oligoclase (a variety of plagioclase). Common mineral components include hornblende and biotite. The name has come to be used most frequently as a textural term where it implies ...