Agate from Reichweiler, Germany

Dendrites in agate

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

Dumortierite in rock crystal, Brazil, polarised light

Inclusions of hematite in aquamarine, Tanzania

Agate from Anzi, Maroc

Inclusions of rock crystal and rutile needles in quartz, Brazil, polarised light