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Natural etching structure on a crystal face of diamond (trigons), polarised light
Dumortierite in rock crystal, Brazil, polarised light
Fluid inclusions in quartz with bituminous daughter minerals, China
Fire opal, Mexico
Midge included in amber from the Baltic coast, polarised light
Two-phase inclusion in amethyst, Brazil
Agate from Reichweiler, Germany
Inclusions of rock crystal and rutile needles in quartz, Brazil, polarised light

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