Agate from Reichweiler, Germany

Inclusions of gilalite aggregates in rock crystal from Brazil

Colour zoning in ruby from Mong-Shu, Burma

Agate from Anzi, Maroc

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

«Red fox agate» from Patagonia, Argentina

Dumortierite in rock crystal, Brazil, polarised light

Fluid inclusions in quartz with bituminous daughter minerals, China

Twin-crystal of chrysoberyl