Inclusions of hematite in aquamarine, Tanzania
Fire opal, Mexico
Inclusions of fossil plant debris in opal from Wollo, Ethiopia
Two-phase inclusions in tourmaline from Namibia
Natural etching structure on a crystal face of diamond (trigons), polarised light
Agate from Reichweiler, Germany
Stress fissure («sun spangle») in baltic amber
Spinel crystal in dolomite marble, Burma


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