Inclusions of fossil plant debris in opal from Wollo, Ethiopia
Agate from Reichweiler, Germany
Epigenetic inclusion (probanly melanterite) in quartz, Brazil, crossed polarisers
Dumortierite in rock crystal, Brazil, polarised light
Stress fissure («sun spangle») in baltic amber
Inclusion of apatite in ruby from Tanzania
Fire opal, Mexico
«Red fox agate» from Patagonia, Argentina

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