Deposits of cassiterite under rather exceptional conditions are worked on a large scale in Bolivia; and it is notable thatcassiterite is found in Liassic limestone near Campiglia Marittima in Tuscany.
Pure cassiterite may be colourless, or white, as seen in certain specimens from the Malay Peninsula; but usually the mineral is brown or even black, the colour being referred to the presence of ferric oxide or other impurity.
Cassiterite occurs as a pseudomorph after orthoclase felspar in some of the altered granite of Cornwall, and it has occasionally been found as a cementing material in certain brecciated lodes.
Cassiterite usually occurs as veins or impregnations in granitic rocks, and is especially associated with the quartz-mica rock called greisen.
By the disintegration of tin-bearing rocks and vein-stones, the cassiterite passes into the beds of streams as rolled fragments and grains, or even sand, and is then known as stream tin or alluvial tin.
The usual lustre of crystals of cassiterite is remarkably splendent, even adamantine.
Cassiterite has been worked in the York region, Alaska.
Tin is found in nature chiefly as the oxide (SnO{2}), calledcassiterite or tinstone.
The only important ore of tin is the mineral cassiterite (oxide of tin) described above in the chapter on "Mineralogy.
Cassiterite or tin stone is a heavy ore which occurs in alluvial deposits or in the beds of streams.
Cassiterite goes with boron and tourmaline, topaz, fluor spar and lithia-mica; all containing fluorine.
The oxide of titanium (like cassiterite and quartz) is undecomposed by hydrochloric or nitric acid; so that it is generally found in the residue insoluble in acids.
Tin occurs in nature as cassiterite (containing from 90 to 95 per cent.
Two grams of a mixture of silica and cassiterite left, after reduction in hydrogen, 1.
Those minerals which have a specific gravity approaching that of the cassiterite are not completely removed.
The deposits of Cornwall and of Saxony show transitions from cassiterite veins close to the intrusions into lead-silver veins at a greater distance.
The origin of cassiterite veins, in view of their universal association with granitic rocks, is evidently related to igneous intrusions.
The original home of cassiterite is in veins closely related to granitic rocks.
All these minerals are relatively insoluble and have high specific gravity, and as a consequence they are frequently accumulated in placers, along with cassiterite and other stable, heavy minerals.
Cassiterite is practically insoluble and is very resistant to decomposition by weathering.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "cassiterite" in a variety of sentences. We hope that you will now be able to make sentences using this word.
