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Pegmatitic granite composed of orthoclase and quartz. Granite is a natural source of radiation, like most natural stones. Potassium-40 is a radioactive isotope of weak emission, and a constituent of alkali feldspar, which in turn is a common component of granitic rocks, more abundant in alkali feldspar granite and syenites.
Dedham Granite is a pink to gray medium to coarse grained igneous rock. [3] It is phaneritic, meaning that the crystals are coarse enough to be seen with the naked eye. It is a two mica granite which means there are amounts of both muscovite mica and sericite present. There are also large amounts of quartz and Feldspar (mainly K-feldspar). [3]
Anorthosite and gabbro inclusions are located near Tigerton and Rapakivi-type quartz monzonite occurs near Waupaca. Syenite and the Ninemile Swamp granite occur near Wausau. Between 1.1 and one billion years ago, the Keweenawan Supergroup formed, which now underlies northern Wisconsin, inland and south from the shore of Lake Superior beneath ...
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]
Pikes Peak granite is a 1.08 billion year old Late-Precambrian geologic formation found in the central part of the Front Range of Colorado. It is a coarse-grained pink to light red syenogranite with minor gray monzogranite , and it has a distinctive brick-red appearance where it outcrops.
Different specific granite types have differing propensities to weather, and so differing likelihoods of producing decomposed granite. The parent granite material is a common type of igneous rock that is granular, with its grains large enough to be distinguished with the unaided eye (i.e., it is phaneritic in texture); it is composed of ...
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