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The individual gemstone beads are rectangular in shape and range in size from 9x3 to 11x4 mm
Quartz and Prehnite Geode
originating from the nearby Rubielos de la Cerida impact structure
Strand Length: 35 cm / 13
Biotite Mica Book | Black Crystal | 71 Grams | Ontario, Canada | SO24 Fluellite The individual gemstone beads areThis is a sharp, beautiful, black Biotite crystal book from the Calcite Vein Dikes of the Grenville Geological Province Ontario, Canada. This biotite has classic crystal shape and attractive dark black coloration. This specimen is a great example of both, Biotite is rarely considered a valuable mineral specimen, but it can accompany other minerals and compliment them. In Bancroft, Ontario Biotite forms large crystals with green apatite and hornblende.
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