Agate from Reichweiler, Germany

Two-phase inclusions in sapphire, Sri Lanka

Inclusions of gilalite aggregates in rock crystal from Brazil

Dendrites in agate

Inclusions of hematite in feldspar (sunstone), India

Bubbles and swirls in moldavite (natural glass)

Fluid inclusions in quartz with bituminous daughter minerals, China

Dumortierite in rock crystal, Brazil, polarised light

Stress fissure («sun spangle») in baltic amber