Search results
Results from the WOW.Com Content Network
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. It is common in the continental crust of Earth, where it is found in igneous ...
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 ...
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.
Mineralogy of the Pikes Peak Region. Pikes Peak seen from the Garden of the Gods. The Pikes Peak region is renowned for its rare mineral specimens. It is a favorite collecting area for amateur and serious rock hounds. Scientists from around the world come to Colorado to study the minerals of this region. Because the granite covers a large ...
Porphyry (geology) Porphyry (/ ˈpɔːrfəri / POR-fə-ree) is any of various granites or igneous rocks with coarse-grained crystals such as feldspar or quartz dispersed in a fine-grained silicate -rich, generally aphanitic matrix or groundmass. In its non-geologic, traditional use, the term porphyry usually refers to the purple-red form of ...
Milford pink granite, also known as Milford granite or Milford pink is a Proterozoic igneous rock located in and around the town of Milford, Massachusetts, covering an area of approximately 39 square miles (100 km 2), as mapped by the USGS. It is also sometimes referred to as Braggville granite, for several quarries in the neighboring village ...
A “remarkable” subterranean passage of granite and terracotta was found under N.C 200 in Cabarrus County in North Carolina and state officials are calling the structure “a treasure ...
The Hardwick and Coys Hill granites both intruded at this period and ultramafic rocks found with the Coys Hill granite may preserve the ancient oceanic crust of the Iaptetus Ocean. [7] At the core of the Bronson Hill belt is the Monson gneiss, rich in microcline, plagioclase, amphibole schist, and eye-shaped augen gneiss.