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Island
obs. form of Iceland. Island crystal, Iceland spar.
1676Worlidge Bees i. 3 That fossile Glass we call Island glass, wherewith Ships are glaz'd. 1727–41Chambers Cycl. s.v. Crystal, Island Crystal, is a transparent fissile stone, brought from Iceland, soft as talc, clear as rock-crystal.., famous among optic writers for its unusual refractions..Whereas in other pellucid bodies there is only one refraction, in this there are two; so that objects received thro' it appear double. 1812Sir H. Davy Chem. Philos. 197 A plain surface of island crystal, or rhomboidal carbonate of lime. |