Agate from Anzi, Maroc
Agate from Reichweiler, Germany
Spinel crystal in dolomite marble, Burma
Fluid inclusions containing mica and quartz, in aquamarine from Pakistan
Natural etching structure on a crystal face of diamond (trigons), polarised light
Structure in a healing fissure in topaz from Brazil
Stress fissure («sun spangle») in baltic amber
Inclusions of chrysotile fibres in demantoide garnet from Ural Mountains, Russia
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