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

Stress fissure («sun spangle») in baltic amber

Dendrites in agate

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

Bubbles and swirls in moldavite (natural glass)

Inclusions of chrysotile fibres in demantoide garnet from Ural Mountains, Russia

«Red fox agate» from Patagonia, Argentina

Inclusion of apatite in ruby from Tanzania

Inclusions of rutile (dark crystal and fine needles) and clusters of zircon grains in umbalite garnet, Tanzania