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DescriptionAmethyst (purple quartz) 12.jpg English: A mineral is a naturally-occurring, solid, inorganic, crystalline substance having a fairly definite...
DescriptionAmethyst (purple quartz) 9.jpg English: A mineral is a naturally-occurring, solid, inorganic, crystalline substance having a fairly definite...
DescriptionAmethyst (purple quartz) 10.jpg English: A mineral is a naturally-occurring, solid, inorganic, crystalline substance having a fairly definite...
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1829 book - An introduction to the study of mineralogy ; or, student's pocket companion (IA AnIntroductionToTheStudyOfMineralogy) (page 2 crop).jpg....
DescriptionAmethyst & purple chalcedony (Tertiary; Sulawesi, Indonesia) 2 (44651309754).jpg "Grape agate" - amethyst & purple chalcedony from the Tertiary...
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