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

Fire opal, Mexico

Partially etched diamond crystal

Agate from Anzi, Maroc

Structure in a healing fissure in topaz from Brazil

Two-phase inclusion in amethyst, Brazil

Two-Phase inclusions and rutile needles in rock crystal from Brazil

Two-phase inclusions in tourmaline from Namibia

Inclusions of gilalite aggregates in rock crystal from Brazil