It contains tin dioxide. 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 As its crystals have many faces, it looks sparkling. It is a black mineral is a member of rutile group and an important ore of tin. Since ages, it has been the main ore of tin and continues to be so even today. 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. Cassiterite Cassiterite has been the chief tin ore throughout history and remains the most important source of tin today. Many of the economical Cassiterite deposits exist in placer stream deposits where this very heavy mineral collects as rounded water worn pebbles. It is the main ore of tin. 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. Its luster and multiple crystal faces produce a desirable gem. Because of its sheen and multi-faceted crystals (multiple crystal faces). The name Cassiterite is derived from the Greek "kassiteros", meaning tin. Cassiterite is a tin oxide mineral, SnO 2. Its primary chemical formula is: SnO 2 . It is an attractive gem. Cassiterite is tin oxide and generally opaque, though its thin crystals are translucent. It is the main ore of tin. It is generally opaque, but it is translucent in thin crystals. Cassiterite. Cassiterite is a mineral. Cassiterite (tin ore) is a tin oxide mineral found mainly in vein deposits. 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. This page was last changed on 7 October 2014, at 09:56. Its Mohs hardness is 6-7. Cassiterite occurs in hydrothermal veins, associated with acid rocks, granites, as in Cornwall. Chemical Formula SnO2 Its chemical formula is SnO 2.. It is black because of impurities. 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: 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. 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. VI. Cassiterite is a common and widespread mineral and is the main ore of tin. It is a reddish, brownish, or yellowish mineral consisting of tin dioxide. 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