(mineralogy) A hexagonal-pyramidal mineral containing aluminum, hydrogen, magnesium, manganese, oxygen, and silicon.

An ultraroyalist in France. / An extremist, especially an ultranationalist.

The act of detecting or sensing something; discovering something that was hidden or disguised.

(transitive) To treat rubber with heat and (usually) sulphur to harden it and make it more durable. / (intransitive) To undergo such treatment.