Natural etching structure on a crystal face of diamond (trigons), polarised light
Inclusions of gilalite aggregates in rock crystal from Brazil
Inclusions of fossil plant debris in opal from Wollo, Ethiopia
Fluid inclusions in quartz with bituminous daughter minerals, China
Spinel crystal in dolomite marble, Burma
Agate from Reichweiler, Germany
Twin-crystal of chrysoberyl
Fire opal, Mexico

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