Epigenetic inclusion (probanly melanterite) in quartz, Brazil, crossed polarisers
Natural etching structure on a crystal face of diamond (trigons), polarised light
Inclusions of fossil plant debris in opal from Wollo, Ethiopia
Fluid inclusions containing mica and quartz, in aquamarine from Pakistan
Two-phase inclusions in tourmaline from Namibia
Fire opal, Mexico
Twin-crystal of chrysoberyl
Inclusions of hematite in feldspar (sunstone), India

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