amphetamine vs quartz

amphetamine

noun
  • The racemic freebase of 1-phenylpropan-2-amine; an equal parts mixture of levoamphetamine and dextroamphetamine in their pure amine forms. 

  • Any mixture of the two amphetamine enantiomers, dextroamphetamine and levoamphetamine. 

  • A potent central nervous system stimulant of the phenethylamine chemical class that is used to treat ADHD, narcolepsy, and obesity. 

  • Referring to a substituted amphetamine; a member of the amphetamine class of chemicals. 

quartz

noun
  • 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. 

How often have the words amphetamine and quartz occurred in a corpus of books? (source: Google Ngram Viewer )