Native tin dioxide tin stone a mineral happening in tetragonal crystals of reddish brown color and brilliant adamantine luster in addition massive occasionally in compact types with concentric fibrous structure resembling timber timber tin additionally in rolled fragments or pebbly flow tin it's the main supply of metallic tin See Ebony tin under Black
- a tough hefty dark mineral that is the main way to obtain tin
- local tin dioxide; tin stone; a mineral happening in tetragonal crystals of reddish brown shade, and brilliant adamantine luster; in addition huge, often in compact forms with concentric fibrous construction resembling timber (lumber tin), additionally in rolled fragments or pebbly (Stream tin). It is the primary way to obtain metallic tin. See Ebony tin, under Black.
It is an amorphous white powder; but it may also be obtained in crystals isomorphous with cassiterite by heating the amorphous form with borax to a very high temperature.