Dendrites in agate

Inclusions of hematite in aquamarine, Tanzania

Two-phase inclusions in tourmaline from Namibia

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

Dumortierite in rock crystal, Brazil, polarised light

Bubbles and swirls in moldavite (natural glass)

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

Two-phase inclusion in amethyst, Brazil

Inclusions of anatase crystal and rutile fibres in rock crystal from Brazil