It contains tin dioxide. Cassiterite Cassiterite has been the chief tin ore throughout history and remains the most important source of tin today. Cassiterite: Baur W H (1956) Uber die verfeinerung der kristallstrukturbestimmung einiger vertreter des rutiltyps: TiO2, SnO2, GeO2 und MgF2 Acta Crystallographica 9 515-520: 1956: 0: 293: 0009406: Cassiterite: Baur W H, Khan A A (1971) Rutile-type compounds. VI. Its chemical formula is SnO 2.. Durable and dense, it has been used as the chief ore of tin from early history throughout the ages, and remains so even today. It is the main ore of tin. Since ages, it has been the main ore of tin and continues to be so even today. It is the main ore of tin. It is generally opaque, but it is translucent in thin crystals. It is black because of impurities. Many of the economical Cassiterite deposits exist in placer stream deposits where this very heavy mineral collects as rounded water worn pebbles. Cassiterite. It is a reddish, brownish, or yellowish mineral consisting of tin dioxide. A tin oxide mineral found in vein deposits, granitic rocks, pegmatites, areas of contact metamorphism and the altered zone of ore deposits is cassiterite. Cassiterite is tin oxide and generally opaque, though its thin crystals are translucent. This page was last changed on 7 October 2014, at 09:56. It is a primary ore of the mineral tin, which is widely used in a variety of products such as tin cans and electric conductors.. Cassiterite is a heavy and metallic mineral rock that has a brown or black colour when iron impurities are present. The name Cassiterite is derived from the Greek "kassiteros", meaning tin. Cassiterite is a common and widespread mineral and is the main ore of tin. It is also given the name "stream tin" because it is also found in placer deposits where it is most widely mined ore of tin. Its chemical formula is SnO 2. A10も of ore minerals such as cassiterite, wolframite, hematite, stannite, ... Luobusaite(β-FeSi2) (IMA2005-052a) is a nature Si-Fe alloy new mineral with formula Fe0.32 Si2.00. It is a black mineral is a member of rutile group and an important ore of tin. As its crystals have many faces, it looks sparkling. Its Mohs hardness is 6-7. Its primary chemical formula is: SnO 2 . It forms in mid- to high-temperature hydrothermal veins through granite, granite pegmatites, and rhyolite, can occasionally be found in contact metamorphic deposits, and can also occur in large alluvial placer deposits. Its luster and multiple crystal faces produce a desirable gem. General Cassiterite Information : Chemical Formula: SnO2 : Composition: Molecular Weight = 150.71 gm Tin 78.77 % Sn 100.00 % SnO 2: Oxygen 21.23 % O: 100.00 % 100.00 % = TOTAL OXIDE Cassiterite occurs in hydrothermal veins, associated with acid rocks, granites, as in Cornwall. 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