Abstract
Well-rounded to very angular grains, often of moderate sphericity (Figs. 92–95). Fluid and mineral inclusions are common (Fig. 95). Grains may be single crystals or polycrystalline, comprising of a number of crystals per grain (best seen in cross-polars) and may show secondary outgrowths. Quartz bipyramids, characteristic of volcanic quartz are rare, although they may occur in some volcaniclastic sands. Grain form can be an important indicator of provenance.
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© 1989 Elsevier Science Publishers Ltd
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Rothwell, R.G. (1989). Quartz. In: Minerals and Mineraloids in Marine Sediments. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-1133-8_19
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DOI: https://doi.org/10.1007/978-94-009-1133-8_19
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-7002-7
Online ISBN: 978-94-009-1133-8
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