Epigenetic inclusion (probanly melanterite) in quartz, Brazil, crossed polarisers
Midge included in amber from the Baltic coast, polarised light
Dumortierite in rock crystal, Brazil, polarised light
Fluid inclusions in quartz with bituminous daughter minerals, China
Natural etching structure on a crystal face of diamond (trigons), polarised light
Two-phase inclusion in amethyst, Brazil
Inclusions of rutile (dark crystal and fine needles) and clusters of zircon grains in umbalite garnet, Tanzania
Inclusions of anatase crystal and rutile fibres in rock crystal from Brazil

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