A blue semi precious stone, frequently used in jewelry for at least 3,500 years
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Category: <span>L</span>
Small volcanic ejections of solid lava which range from 2 and 64 millimeters in size
Pertaining to the cutting, polishing, carving or setting of precious or semi-precious stones
The mass movement of loose alluvial debris, usually on a steep gradient
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]