Epigenetic inclusion (probanly melanterite) in quartz, Brazil, parallel polarisers
Epigenetic inclusion (probanly melanterite) in quartz, Brazil, parallel polarisers
Fire opal, Mexico
Fire opal, Mexico
Two-phase inclusions in sapphire, Sri Lanka
Two-phase inclusions in sapphire, Sri Lanka
Spinel crystal in dolomite marble, Burma
Spinel crystal in dolomite marble, Burma
Stress fissure («sun spangle») in baltic amber
Stress fissure («sun spangle») in baltic amber
Dumortierite in rock crystal, Brazil, polarised light
Dumortierite in rock crystal, Brazil, polarised light
Agate from Reichweiler, Germany
Agate from Reichweiler, Germany
Bubbles and swirls in moldavite (natural glass)
Bubbles and swirls in moldavite (natural glass)