Inclusions of gilalite aggregates in rock crystal from Brazil

Agate from Reichweiler, Germany

Midge included in amber from the Baltic coast, polarised light

Fire opal, Mexico

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

Partially etched diamond crystal

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

Inclusions of rock crystal and rutile needles in quartz, Brazil, polarised light

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