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)

Agate from Reichweiler, Germany

Dendrites in agate

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

Inclusions of gilalite aggregates in rock crystal from Brazil

Twin-crystal of chrysoberyl

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