Inclusions of rutile (dark crystal and fine needles) and clusters of zircon grains in umbalite garnet, Tanzania
Natural etching structure on a crystal face of diamond (trigons), polarised light
Agate from Reichweiler, Germany
Fluid inclusions in quartz with bituminous daughter minerals, China
Dumortierite in rock crystal, Brazil, polarised light
Twin-crystal of chrysoberyl
Two-phase inclusions in tourmaline from Namibia
Bubbles and swirls in moldavite (natural glass)

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