Partially etched diamond crystal

Fluid inclusions in quartz with bituminous daughter minerals, China

Fluid inclusions containing mica and quartz, in aquamarine from Pakistan

Stress fissure («sun spangle») in baltic amber

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

Spinel crystal in dolomite marble, Burma

Dendrites in agate

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