Fire opal, Mexico

Two-phase inclusions in sapphire, Sri Lanka

Structure in a healing fissure in topaz from Brazil

«Red fox agate» from Patagonia, Argentina

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

Agate from Anzi, Maroc

Dendrites in agate

Two-phase inclusion in amethyst, Brazil

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