Epigenetic inclusion (probanly melanterite) in quartz, Brazil, parallel polarisers

Inclusions of rock crystal and rutile needles in quartz, Brazil, polarised light

Twin-crystal of chrysoberyl

Inclusions of hematite in feldspar (sunstone), India

Inclusions of rutile (dark crystal and fine needles) and clusters of zircon grains in umbalite garnet, Tanzania

Natural etching structure on a crystal face of diamond (trigons), polarised light

Fire opal, Mexico

Epigenetic inclusion (probanly melanterite) in quartz, Brazil, crossed polarisers

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