Natural etching structure on a crystal face of diamond (trigons), polarised light
Bubbles and swirls in moldavite (natural glass)
Twin-crystal of chrysoberyl
Inclusion of apatite in ruby from Tanzania
«Red fox agate» from Patagonia, Argentina
Epigenetic inclusion (probanly melanterite) in quartz, Brazil, parallel polarisers
Agate from Anzi, Maroc
Epigenetic inclusion (probanly melanterite) in quartz, Brazil, crossed polarisers

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