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Schweizerische Gemmologische Gesellschaft
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Agate from Reichweiler, Germany
Epigenetic inclusion (probanly melanterite) in quartz, Brazil, crossed polarisers
Inclusions of hematite in feldspar (sunstone), India
Epigenetic inclusion (probanly melanterite) in quartz, Brazil, parallel polarisers
Two-phase inclusions in tourmaline from Namibia
Two-phase inclusions in sapphire, Sri Lanka
Partially etched diamond crystal
Two-Phase inclusions and rutile needles in rock crystal from Brazil

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