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Medium-grained (mL, 250-350µ), poorly sorted, subangular-subrounded
Sample |
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number | Collector | Date of sampling |
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heubeck0140 |
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Collector:
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Elisha M. Shemang, Botswana; Dept. of Geology, University of Botswana |
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Date:
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11.01.2008 |
Comments:
Mineral color in quartz is due to impurities of rutile, tourmaline or Fe-oxides intergrown
with the quartz crystal. Additionally, gas and liquid bubbles trapped during crystallization reduce
transparency