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A larvikite quarry in Larvik, Norway, 2008 Polished larvikite (marketed as "Blue Pearl Granite"), showing labradorescence, is a popular decorative stone. Light larvikite with a polished surface Larvikite is an igneous rock , specifically a variety of monzonite , [ 1 ] notable for the presence of thumbnail-sized crystals of feldspar .
The private Spanish company Cosentino brand Silestone and the public Israeli company Caesarstone are the most recognizable brands for quartz, as well as Totem Quartz, an Iranian company which has a huge market in the middle east and Central Asia. Gulfstone, an Oman-based company, is the only producer of engineered quartz stone in the GCC.
Quartz is present in significant amounts. Biotite and/or hornblende constitute the dark minerals. Because of its coloring, it is often confused with granite, but whereas granite contains more than 20% quartz, quartz monzonite is only 5–20% quartz. Rock with less than five percent quartz is classified as monzonite.
Quartz porphyry from the island of Alnö, Sweden. Phenocrysts of clear glassy rounded quartz and white orthoclase feldspar are set in a fine-grained matrix. Sample is just over 10 cm long. Quartz-porphyry, in layman's terms, is a type of volcanic rock containing large porphyritic crystals of quartz.
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.
Granite Tectonics Of Pikes Peak Composite Batholith, Colorado Pegmatite Symposium - 1986, R.M. Hutchinson - Colorado School of Mines; Colorado Gem Trails and Mineral Guide, Richard M. Pearl, 3rd rev. ed. 1993; A Brief Summary of the Mineral Deposits of the Pikes Peak Batholith, Colorado, Rocks & Minerals, September 1, 2001
Durr Al Najaf (Arabic: دُر ٱلنَّجَف) is a glossy and clear gemstone from the quartz family. The name means "pearl of Najaf" as it can only be sourced from Wadi-al-Salaam (Arabic: وادي السلام, romanized: Wādī al-Salām, lit. 'Valley of Peace') in Najaf, Iraq. The gemstone is found along the west of Najaf close by the Najaf ...