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Dumortierite in rock crystal, Brazil, polarised light
Colour zoning in ruby from Mong-Shu, Burma
Midge included in amber from the Baltic coast, polarised light
Two-phase inclusions in sapphire, Sri Lanka
Agate from Anzi, Maroc
Structure in a healing fissure in topaz from Brazil
Epigenetic inclusion (probanly melanterite) in quartz, Brazil, parallel polarisers
«Red fox agate» from Patagonia, Argentina

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  • Gemmology
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