A highly addictive phenethylamine stimulant drug, similar to cocaine. Its systematic (IUPAC) name is (S)-N-methyl-1-phenylpropan-2-amine.
Crystal meth: methamphetamine hydrochloride.
The most abundant mineral on the earth's surface, of chemical composition silicon dioxide, SiO₂. It occurs in a variety of forms, both crystalline and amorphous. Found in every environment.