A little off topic, but Iceland Spar features prominently in Pynchon's "Against the Day"[1]. It is a pretty amazing book that might appeal to this audience. [

A little off topic, but Iceland Spar features prominently in Pynchon's "Against the Day"[1]. It is a pretty amazing book that might appeal to this audience. [1] http://en.wikipedia.org/wiki/Against_the_Day#Doubling http://en.wikipedia.org/wiki/Against_the_Day#Doubling