a brown or black mineral, tin dioxide, SnO 2 , that crystallizes in the tetragonal system; tinstone: the principal ore of tin.
Historical Examples

The tin occurs in the form of cassiterite, and is found chiefly in or near the crystalline rocks, especially the granite.
Encyclopaedia Britannica, 11th Edition, Volume 17, Slice 4 Various

Our new ledge is a jim-dandy; and seem’ as I cheated the woman out of her cassiterite, I’m bound to make it good in yellow gold.
The Trail of a Sourdough May Kellogg Sullivan

Both of these rocks carry frequently small percentages of tin oxide (cassiterite) and may be worked as ores of tin.
Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 5 Various

cassiterite is practically insoluble and is very resistant to decomposition by weathering.
The Economic Aspect of Geology C. K. Leith

The original home of cassiterite is in veins closely related to granitic rocks.
The Economic Aspect of Geology C. K. Leith

The usual lustre of crystals of cassiterite is remarkably splendent, even adamantine.
Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 4 Various

Those minerals which have a specific gravity approaching that of the cassiterite are not completely removed.
A Textbook of Assaying: For the Use of Those Connected with Mines. Cornelius Beringer and John Jacob Beringer

The hardness of cassiterite is 6.5, so that it cannot be scratched with a knife, and is nearly as hard as quartz.
Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 4 Various

The crystals occurred in association with topaz, fluorspar and cassiterite; but they were mostly of rather pale colour.
Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 Various

cassiterite goes with boron and tourmaline, topaz, fluor spar and lithia-mica; all containing fluorine.
The A B C of Mining Charles A. Bramble

a black or brown mineral, found in igneous rocks and hydrothermal veins. It is a source of tin. Composition: tin oxide. Formula: SnO2. Crystal structure: tetragonal Also called tinstone


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