Spinel crystal in dolomite marble, Burma

Stress fissure («sun spangle») in baltic amber

Dumortierite in rock crystal, Brazil, polarised light

Fluid inclusions containing mica and quartz, in aquamarine from Pakistan

Inclusions of hematite in aquamarine, Tanzania

Inclusions of gilalite aggregates in rock crystal from Brazil

Bubbles and swirls in moldavite (natural glass)

Inclusions of fossil plant debris in opal from Wollo, Ethiopia

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