Why collect mineral specimens and crystals?
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Physical Properties of Gemstones - A Complete book
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Best things to look for in Rough Gem Stones
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Loose Gemstones - A complete Guide book of 2020
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Tanzanite, Turquoise & Zircon the Birthstone of December
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Topaz & citrine the Birthstone of November
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Opal & tourmaline the Birthstone of October
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