Webster's English Dictionary

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basalt

ba.salt \b*-'so.lt, 'ba--.\ \b*-'so.l-tik\ n [L basaltes, MS var. of 
   basanites touchstone, fr. Gk basanite]-s (lithos), fr. basanos touchstone, 
   fr. Egypt bhsub-breve>nw : a dark gray to black dense to fine-grained 
   igneous rock that consists of  basic plagioclase, augite, and usu. 
   magnetite - ba.sal.tic aj