Calcium oxide, CaO or powdered calcium carbonate, CaCO
Calcium oxide, CaO or powdered calcium carbonate, CaCO
A green form of titanite
Brownish-black form of coal
Subterraneous horizontal passages in a mine, the usual intersection of a mine shaft
Quartz formed below 573 degrees C, SiO2 possessing less symmetry and hardness than the same formed at a higher temperature
An ore of lithium, 3[K2Li4Al2(Si8O20(OH)4]
Ore containing a small but detectable grade of mineralization, favourable only if the extent of mineralization is enormous, consistent, and accessible
Lens shaped
A trough usually 2 meters long, used for washing gold-bearing earth utilizing moving water and a series of riffles for trapping heavy particles. It is longer than a rocker or sluice
A rock body thick in the middle and tapered out at its ends