Zircon
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“Zircon, a mineral composed of of zirconium silicate, sometimes used as a gem-stone... THe mineral crystallizes in the tetragonal system, generally in combinations of square prisms and square pyramids” (Britannica, 1910).
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Encyclopaedia Britannica (11th ed., vol. 28) (New York, NY: The Encyclopaedia Britannica Company, 1910)
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