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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 AbstractNatural 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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