Twin-crystal of chrysoberyl

Agate from Anzi, Maroc

Stress fissure («sun spangle») in baltic amber

Inclusions of rock crystal and rutile needles in quartz, Brazil, polarised light

Partially etched diamond crystal

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

Inclusion of apatite in ruby from Tanzania

Two-phase inclusions in sapphire, Sri Lanka

Bubbles and swirls in moldavite (natural glass)