Pegmatite
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Tourmaline
Zambia
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Topaz
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Sapphire
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Sandstone
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Economy of Sri Lanka
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South America
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Piezoelectricity
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Pacific Beach, San Diego
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October
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Maine
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Mineral
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Latin America
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Gemstone
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Graphite
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Emerald
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Economy of Afghanistan
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Beryl
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Economy of Brazil
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Brazil
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Amblygonite
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Henry Fox Talbot
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Theophrastus
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Rutherford County, North Carolina
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Pleochroism
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Lustre (mineralogy)
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Dichroism
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Chrysoberyl
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Plagioclase
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Chrysolite
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Ferroelectricity
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Ruby
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