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Sphalerite<br />
Sulphide ore<br />
Topaz<br />
Till<br />
Trace element<br />
Ultrabasite<br />
A zinc-bearing sulphide mineral (ZnS). The most important mineral<br />
for extraction of zinc.<br />
Ore that contains sulphide mineral(s).<br />
An aluminum-silicate mineral sometimes found in tin-bearing<br />
veins.<br />
A glacial sediment consisting of a mixture of clay, sand, gravel<br />
and bouldes ranging widely in size and shape.<br />
An element that is found in very small quantities.<br />
A plutonic rock having an extremely low silica content<br />
(< 45 percent SiO 2 ). Synonymous term: ultramafite.<br />
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