syenite is a coarse-grained intrusive igneous rock with a general composition similar to that of granite, but deficient in quartz, which, if present at all, occurs in relatively small concentrations < 5% .some syenites contain larger proportions of mafic components and smaller amounts of felsic material than most granites; those are classed as being of intermediate composition.
quartz movement. on december 25, 1969, seiko released the world's first quartz watch, the seiko quartz astron, which marked the beginning of the quartz revolution. the watch uses a crystal oscillator for accuracy, where the crystal generates steady vibration when voltage is applied to it.
quartzolite or silexite is an intrusive igneous rock, in which the mineral quartz is more than 90% of the rock's felsic mineral content, with feldspar at up to 10%.: 135 typically, quartz forms more than 60% of the rock, the rest being mostly feldspar although minor amounts of mica or amphibole may also be present.
smoky quartz is a grey, translucent variety of quartz that ranges in clarity from almost complete transparency to an almost-opaque brownish-gray or black crystal. like other quartz gems, it is a silicon dioxide crystal. the smoky colour results from free silicon formed from the silicon dioxide by natural irradiation.
vasily vasilivich konovalenko russian: василий васильевич коноваленко, koʊ-noʊ-va-ɪŋ-koʊ; 5 july 1929 – 27 january 1989 was a ukrainian-born sculptor who was the creator of unique miniatures in the genre of gem- and mineral-cutting or carving.
quartz fiber is a fiber created from high purity natural quartz crystals. it is made by first softening quartz rods in an oxyhydrogen flame and then creating filaments from the rods. since natural quartz crystals of high purity are rare, quartz fiber is more expensive than alternatives glass fiber and high silica fiber and has limited applications.
granite is classified according to the qapf diagram for coarse grained plutonic rocks and is named according to the percentage of quartz, alkali feldspar orthoclase, sanidine, or microcline and plagioclase feldspar on the a-q-p half of the diagram. true granite according to modern petrologic convention contains both plagioclase and alkali .
dumortierite quartz is blue colored quartz containing abundant dumortierite inclusions. dumortierite was first described in 1881 for an occurrence in chaponost, in the rhône-alps of france and named for the french paleontologist eugène dumortier 1803–1873 .
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huoshenshan hospital chinese: 火神山医院; pinyin: huǒshénshān yīyuàn; literally: 'mount fire god hospital' is an emergency specialty field hospital constructed from 23 january 2020 to 2 february 2020 in response to the 2019–20 coronavirus pandemic. the facility is located near the zhiyin lake 知音湖 in caidian district, wuhan, hubei, china, next to wuhan workers' sanatorium .
russian tvorog, a firmer and drier variety of quark. quark or quarg is a type of fresh dairy product made by warming soured milk until the desired amount of curdling is met, and then straining it. it can be classified as fresh acid-set cheese.traditional quark can be made without rennet, but in modern dairies small quantities of rennet are typically added.. it is soft, white and unaged, and .