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Series: EMU Notes in Mineralogy series
Published: 01 January 2019
DOI: 10.1180/EMU-notes.20.2
EISBN: 9780903056625
... then encompasses chalcedony, agate and chalcedony varieties (carnelian, sard, onyx, sardonyx, chrysoprase, Cr-chalcedony, ‘gem silica’ or ‘chrysocolla chalcedony’ and heliotrope), following the same scheme as was adopted for opals. Terminology, distinguishing features, formation conditions, information derived...
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Journal Article
Published: 01 February 2012
Mineralogical Magazine (2012) 76 (1): 115–127.
...J. Götze; L. Nasdala; U. Kempe; E. Libowitzky; A. Rericha; T. Vennemann Abstract Natural onyx agate from Mali was investigated in an integrated mineralogical and chemical study to reveal the origin of the unusual black colouration. Detailed studies by polarizing microscopy, scanning electron...
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