Inclusions of gilalite aggregates in rock crystal from Brazil

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

Structure in a healing fissure in topaz from Brazil

Partially etched diamond crystal

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

Inclusions of hematite in feldspar (sunstone), India

Dumortierite in rock crystal, Brazil, polarised light

Fire opal, Mexico

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