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