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Aberdeen Quarry, an abandoned granite quarry in Gunnison County, Colorado. Its granite was used in construction of the Colorado State Capitol; Marble, Colorado, only site of Yule Marble quarrying, in the West Elk Mountains. 99.5% pure calcite, discovered in 1873, source of marble for the Tomb of the Unknowns and for the exterior of the Lincoln ...
Rounded brown-weathering boulders give the Boulder Batholith its name. The Boulder Batholith is a relatively small batholith in southwestern Montana, United States, exposed at the surface as granite (more specifically quartz monzonite) and serving as the host rock for rich mineralized deposits at Butte and other locations.
Fission tracks – destructive remnants of radioactive decay in Uranium-bearing minerals – were shorter than expected in samples taken from several Sierra Nevada plutons. This implied a late-Cenozoic residency at depth, meaning the unroofing and uplift of the Sierra Nevada block happened rapidly near the end of the Cenozoic.
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]
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.
For instance, the rhyolite Blue Hills quartz porphyry erupted from the Blue Hills volcanoes and the Quincy granite intruded Cambrian sediments. Quartz porphyry also formed in the Norfolk Basin, which took shape due to tectonic compression in the Alleghanian orogeny of the Pennsylvanian, although this rock is only exposed some places among a ...
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