Natural etching structure on a crystal face of diamond (trigons), polarised light
Natural etching structure on a crystal face of diamond (trigons), polarised light
Dumortierite in rock crystal, Brazil, polarised light
Dumortierite in rock crystal, Brazil, polarised light
Inclusions of rutile (dark crystal and fine needles) and clusters of zircon grains in umbalite garnet, Tanzania
Inclusions of rutile (dark crystal and fine needles) and clusters of zircon grains in umbalite garnet, Tanzania
Dendrites in agate
Dendrites in agate
Epigenetic inclusion (probanly melanterite) in quartz, Brazil, crossed polarisers
Epigenetic inclusion (probanly melanterite) in quartz, Brazil, crossed polarisers
Spinel crystal in dolomite marble, Burma
Spinel crystal in dolomite marble, Burma
Two-Phase inclusions and rutile needles in rock crystal from Brazil
Two-Phase inclusions and rutile needles in rock crystal from Brazil
Two-phase inclusion in amethyst, Brazil
Two-phase inclusion in amethyst, Brazil