Epigenetic inclusion (probanly melanterite) in quartz, Brazil, parallel polarisers

Stress fissure («sun spangle») in baltic amber

Midge included in amber from the Baltic coast, polarised light

Agate from Reichweiler, Germany

Inclusions of hematite in feldspar (sunstone), India

Bubbles and swirls in moldavite (natural glass)

Dendrites in agate

Natural etching structure on a crystal face of diamond (trigons), polarised light

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