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

Dendrites in agate

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

Twin-crystal of chrysoberyl

Two-phase inclusion in amethyst, Brazil

Partially etched diamond crystal

Bubbles and swirls in moldavite (natural glass)

Two-phase inclusions in tourmaline from Namibia

Inclusions of hematite in aquamarine, Tanzania