1 By mechanical compression other bodies were also made to imitate the Iceland spar .
2 One uses Iceland spar under colossal pressures, that is all.
3 Block of Iceland spar (very transparent to ordinary light, but very opaque to Röntgen rays).
4 An eminent example of magne-crystallic action adduced by Plucker, and experimented on by Faraday, was Iceland spar .
5 The same remark applies to the line joining the opposite blunt angles of a crystal of Iceland spar .
6 An able optician, named Nicol, cut a crystal of Iceland spar in two halves in a certain direction.
7 Double refraction is displayed in a particularly impressive manner by Iceland spar , which is crystallized carbonate of lime.
8 Transparent calcite, a mineral commonly called " Iceland spar , " is found, one mine of which furnishes an excellent quality.
9 Iceland spar also cleaves in three directions, not at right angles, but oblique to each other, the resulting solid being a rhomboid.
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