Inclusions of anatase crystal and rutile fibres in rock crystal from Brazil
Agate from Reichweiler, Germany
Fluid inclusions containing mica and quartz, in aquamarine from Pakistan
Structure in a healing fissure in topaz from Brazil
Natural etching structure on a crystal face of diamond (trigons), polarised light
Agate from Anzi, Maroc
Twin-crystal of chrysoberyl
Dumortierite in rock crystal, Brazil, polarised light

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