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Quartz diorite from Dúbrava, Nízke Tatry Mountains, Slovakia. Quartz diorite is an igneous, plutonic rock, of felsic composition, with phaneritic texture. Feldspar is present as plagioclase (typically oligoclase or andesine) with 10% or less potassium feldspar. Quartz is present at between 5 and 20% of the rock.
The quartz appears as rounded, corroded phenocrysts, or as an element of the ground-mass. [3] The plagioclase in dacite ranges from oligoclase to andesine and labradorite . Sanidine occurs, although in small proportions, in some dacites, and when abundant gives rise to rocks that form transitions to the rhyolites.
The north end of the island is an unfoliated calc-alkaline pluton of the Bordeaux Diorite Complex consisting of diorite, tonalite, and granodiorite. This is also dated at 570 million years ago . On the central east coast around Saint Peter Port is the St Peter Port Gabbro containing layers with olivine , hornblende and two kinds of pyroxene .
Tilted Towers was a small city location in Fortnite: Battle Royale, [1] [2] and a current location in Fortnite Reload. [3] Located near the center of the map, the city is composed of several large skyscrapers with cramped interiors, each consisting of several stories, [1] [2] the tallest of which is a large clock tower. [4]
The name diorite (from Ancient Greek διορίζειν, "to distinguish") was first applied to the rock by René Just Haüy [10] on account of its characteristic, easily identifiable large crystals of hornblende. [4] Dioritoids form a family of rock types similar to diorite, such as monzodiorite, quartz diorite, or nepheline-bearing diorite ...
The Norbeck Intrusive Suite is an Ordovician granitic pluton in Montgomery County, Maryland.The intrusive suite was originally mapped as the Norbeck Quartz Diorite by Hopson, [1] and is shown as such on the Geologic Map of Maryland of 1968. [2]
The quartz percentage among felsic minerals in TTG rocks is usually larger than 20% but less than 60%. [1] In tonalite and trondhjemite, more than 90% of the feldspars are plagioclase, while in granodiorite, this number is between 65% and 90%. [1] Trondhjemite is a special kind of tonalite, with most of the plagioclase in the rock being ...
"Imperial Porphyry" from the Red Sea Mountains of Egypt A waterworn cobble of porphyry Rhyolite porphyry from Colorado; scale bar in lower left is 1 cm (0.39 in). Porphyry (/ ˈ p ɔːr f ə r i / 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.