A mass of igneous rock intruding between older rock strata
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Category: <span>S</span>
A soft, light alkaline element. Symbol, Na
A light non-metallic element. Symbol, Si
Sodium carbonate, Na2CO3
A rock whose major constituent is quartz
The massive form of talc
A transparent, light mineral forming quartz when fused, Silicon dioxide, SiO2
A metal refinery utilizing heated crucibles as a primary means of refinement
A long rectangular box having raised walls along its length, and a series of raised or recessed riffles between its walls, used for the recovery of gold and heavy placer minerals
The eroded surface at the edge of a fault caused by friction