Stress fissure («sun spangle») in baltic amber

Bubbles and swirls in moldavite (natural glass)

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

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

Fluid inclusions in quartz with bituminous daughter minerals, China

Inclusions of chrysotile fibres in demantoide garnet from Ural Mountains, Russia

Natural etching structure on a crystal face of diamond (trigons), polarised light

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