Fluid inclusions in quartz with bituminous daughter minerals, China

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

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

Two-phase inclusions in sapphire, Sri Lanka

Bubbles and swirls in moldavite (natural glass)

Dendrites in agate

Spinel crystal in dolomite marble, Burma

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

«Red fox agate» from Patagonia, Argentina