Natural etching structure on a crystal face of diamond (trigons), polarised light
Epigenetic inclusion (probanly melanterite) in quartz, Brazil, parallel polarisers
Two-Phase inclusions and rutile needles in rock crystal from Brazil
Midge included in amber from the Baltic coast, polarised light
Inclusions of rutile (dark crystal and fine needles) and clusters of zircon grains in umbalite garnet, Tanzania
Inclusions of rutile (dark crystal and fine needles) and clusters of zircon grains in umbalite garnet, Tanzania
Twin-crystal of chrysoberyl
Bubbles and swirls in moldavite (natural glass)

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