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document.write('Crystal menu\n | \nOctahedrally defined crystals\n | \nCFU--crystal forming units\n | \nStaurolite crystals\n | \nPhillipsite crystals\n | \nSilica crystals\n | \nCarbon crystals\n | \nZnO-tetrapod\n | \nZnSe-crystal\n | \nSemiconductors\n | \nSemiconductors--CFU joining\n | \nSemiconductors--Hexagonal');