Dendrites in agate
Dumortierite in rock crystal, Brazil, polarised light
Agate from Reichweiler, Germany
Epigenetic inclusion (probanly melanterite) in quartz, Brazil, parallel polarisers
Partially etched diamond crystal
Stress fissure («sun spangle») in baltic amber
Inclusions of rock crystal and rutile needles in quartz, Brazil, polarised light
Inclusions of rutile (dark crystal and fine needles) and clusters of zircon grains in umbalite garnet, Tanzania

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