The tin occurs in the form of cassiterite, and is found chiefly in or near the crystalline rocks, especially the granite.
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.
Both of these rocks carry frequently small percentages of tin oxide (cassiterite) and may be worked as ores of tin.
cassiterite is practically insoluble and is very resistant to decomposition by weathering.
The original home of cassiterite is in veins closely related to granitic rocks.
The usual lustre of crystals of cassiterite is remarkably splendent, even adamantine.
Those minerals which have a specific gravity approaching that of the cassiterite are not completely removed.
The hardness of cassiterite is 6.5, so that it cannot be scratched with a knife, and is nearly as hard as quartz.
The crystals occurred in association with topaz, fluorspar and cassiterite; but they were mostly of rather pale colour.
cassiterite goes with boron and tourmaline, topaz, fluor spar and lithia-mica; all containing fluorine.