Inclusion of apatite in ruby from Tanzania
Inclusions of fossil plant debris in opal from Wollo, Ethiopia
Natural etching structure on a crystal face of diamond (trigons), polarised light
Colour zoning in ruby from Mong-Shu, Burma
Epigenetic inclusion (probanly melanterite) in quartz, Brazil, parallel polarisers
Dendrites in agate
Partially etched diamond crystal
Two-Phase inclusions and rutile needles in rock crystal from Brazil


Save the date: Zentraltagung in Meisterschwanden 11. bis 13. Juni 2023

(Fotos: Fotograf/in Naturhistorisches Museum Bern)