Inclusions of gilalite aggregates in rock crystal from Brazil
Two-phase inclusion in amethyst, Brazil
Inclusions of rock crystal and rutile needles in quartz, Brazil, polarised light
Epigenetic inclusion (probanly melanterite) in quartz, Brazil, crossed polarisers
Colour zoning in ruby from Mong-Shu, Burma
Spinel crystal in dolomite marble, Burma
Partially etched diamond crystal
Natural etching structure on a crystal face of diamond (trigons), polarised light

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