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Natural etching structure on a crystal face of diamond (trigons), polarised light
Partially etched diamond crystal
Inclusions of rock crystal and rutile needles in quartz, Brazil, polarised light
Inclusions of gilalite aggregates in rock crystal from Brazil
Epigenetic inclusion (probanly melanterite) in quartz, Brazil, crossed polarisers
Inclusions of fossil plant debris in opal from Wollo, Ethiopia
Dumortierite in rock crystal, Brazil, polarised light
Inclusion of apatite in ruby from Tanzania

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