Epigenetic inclusion (probanly melanterite) in quartz, Brazil, crossed polarisers
Inclusions of anatase crystal and rutile fibres in rock crystal from Brazil
Inclusions of hematite in feldspar (sunstone), India
Inclusion of apatite in ruby from Tanzania
Inclusions of rutile (dark crystal and fine needles) and clusters of zircon grains in umbalite garnet, Tanzania
Stress fissure («sun spangle») in baltic amber
Epigenetic inclusion (probanly melanterite) in quartz, Brazil, parallel polarisers
Dumortierite in rock crystal, Brazil, polarised light

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