Inclusions of hematite in feldspar (sunstone), India

Two-phase inclusions in tourmaline from Namibia

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

Agate from Reichweiler, Germany

Two-phase inclusion in amethyst, Brazil

Dumortierite in rock crystal, Brazil, polarised light

Twin-crystal of chrysoberyl

Fluid inclusions in quartz with bituminous daughter minerals, China

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