Brownish-black form of coal
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Tag: <span>L</span>
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]
Emitting light