Two-phase inclusions in tourmaline from Namibia

Dumortierite in rock crystal, Brazil, polarised light

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

Fire opal, Mexico

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

Inclusions of hematite in feldspar (sunstone), India

Stress fissure («sun spangle») in baltic amber

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

Twin-crystal of chrysoberyl