«Red fox agate» from Patagonia, Argentina

Dendrites in agate

Dumortierite in rock crystal, Brazil, polarised light

Inclusions of fossil plant debris in opal from Wollo, Ethiopia

Fire opal, Mexico

Two-phase inclusion in amethyst, Brazil

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

Inclusions of hematite in aquamarine, Tanzania

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