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Crystal. Crystals of amethyst quartz. Microscopically, a single crystal has atoms in a near-perfect periodic arrangement; a polycrystal is composed of many microscopic crystals (called "crystallites" or "grains"); and an amorphous solid (such as glass) has no periodic arrangement even microscopically. A crystal or crystalline solid is a solid ...
1990s. The band was formed in January 1993, by bassist and vocalist Dejan Gvozden and guitarist Željko Markuš, who, having performed blues and rock standards in Belgrade cafes, were joined by drummer Dejan Kostić. By the time the band had written their first hit song "Dva metra" ("Two Meters"), for which the music video was directed by ...
A Amethyst crystals – a purple quartz Apophyllite crystals sitting right beside a cluster of peachy bowtie stilbite Aquamarine variety of beryl with tourmaline on orthoclase Arsenopyrite from Hidalgo del Parral, Chihuahua, Mexico Aurichalcite needles spraying out within a protected pocket lined by bladed calcite crystals Austinite from the Ojuela Mine, Mapimí, Durango, Mexico Ametrine ...
Mineral. Crystals of serandite, natrolite, analcime, and aegirine from Mont Saint-Hilaire, Quebec, Canada. In geology and mineralogy, a mineral or mineral species is, broadly speaking, a solid substance with a fairly well-defined chemical composition and a specific crystal structure that occurs naturally in pure form. [1] [2]
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Primary mineral. A primary mineral is any mineral formed during the original crystallization of the host igneous primary rock and includes the essential mineral (s) used to classify the rock along with any accessory minerals. [1] In ore deposit geology, hypogene processes occur deep below the Earth's surface, and tend to form deposits of ...
Quartz is a hard, crystalline mineral composed of silica ( silicon dioxide ). The atoms are linked in a continuous framework of SiO 4 silicon–oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO 2. Quartz is, therefore, classified structurally as a framework silicate mineral and ...