Cassiterite ( SnO 2 ) is the only commercially important source of tin, although small quantities of tin are recovered from complex sulfides such as stannite, cylindrite, franckeite, canfieldite, and teallite.
12.
It occurred in weathered material with colorless transparent cassiterite [ SnO 2 ], which is thought to have been derived from the oxidation of stannite [ Cu 2 ( Fe, Zn ) SnS 4 ].
13.
If alkali is added to a solution of SnCl 2, a white precipitate of hydrated tin ( II ) oxide forms initially; this then dissolves in excess base to form a stannite salt such as sodium stannite:
14.
If alkali is added to a solution of SnCl 2, a white precipitate of hydrated tin ( II ) oxide forms initially; this then dissolves in excess base to form a stannite salt such as sodium stannite:
15.
85-90 % of tin is presented by cassiterite, mainly quartz associated and is concentrated in lower structural floor Jurassic sandstone and shale : Cassiterite in developed sulphide mineralization in upper floor of cretaceous volcanites is corroded by sulphides forming stannite and hydro-stannite .-showing vertical zonation in the distribution of mineral assemblages that form ore bodies.
16.
85-90 % of tin is presented by cassiterite, mainly quartz associated and is concentrated in lower structural floor Jurassic sandstone and shale : Cassiterite in developed sulphide mineralization in upper floor of cretaceous volcanites is corroded by sulphides forming stannite and hydro-stannite .-showing vertical zonation in the distribution of mineral assemblages that form ore bodies.
17.
The most common minerals in ore-bearing associations of volcanogenic massive sulfide deposits deposits ( non-metamorphosed or oxidized ) and their modern analogues are pyrite, pyrrhotite, chalcopyrite, covellite, sphalerite, galena, tetrahedrite-tennantite, marcasite, realgar, orpiment, proustite-pyrargyrite, wurtzite, stannite ( carbonates ) quartz and native gold, and are differently distributed in the various associations schematized above.
