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Peter Schweitzer
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I don't understand "a quartz calcite". Quartz is SiO2; calcite is CaCO3. Optical quality calcite has such a high birefringence that it is used in petrographic microscopes as a polarizing filter (redirecting away from the observer any light that is not polarized in one specific direction). But what does quartz have to do with it?
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Apr 11, 2011