Dumortierite in rock crystal, Brazil, polarised light

Fluid inclusions in quartz with bituminous daughter minerals, China

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

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

Inclusions of gilalite aggregates in rock crystal from Brazil

Colour zoning in ruby from Mong-Shu, Burma

Stress fissure («sun spangle») in baltic amber

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

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