Epigenetic inclusion (probanly melanterite) in quartz, Brazil, parallel polarisers
Bubbles and swirls in moldavite (natural glass)
Two-phase inclusions in sapphire, Sri Lanka
Structure in a healing fissure in topaz from Brazil
Natural etching structure on a crystal face of diamond (trigons), polarised light
Agate from Reichweiler, Germany
Two-Phase inclusions and rutile needles in rock crystal from Brazil
Agate from Anzi, Maroc

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