Gems and Gem Minerals - Introduction

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1 Page 235 Pearl is not a mineral in the strict sense of the word
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2 Page 235 Pearl is not a mineral in the strict sense of the word, but
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3 Page 236 possesses the peculiar nacreous luster desired in pearls, th
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4 Page 237 the objects are found to be coated with a pearly substance.
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5 Page 238 the scientific name of Meleagrina (Avicula) margaritifera. T
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6 Page 239 obtained there to the queen of Spain. Since that time the fi
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7 Page 240 he searched carefully. Enormous quantities of the Unios are
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8 Page 241 worth noting that this story cannot be literally true, since
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9 Page 243 pound of essence being derived from seven pounds of scales.
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10 Page 242 Emanuel gives the following qualifications, as necessary to
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