Dumortierite in rock crystal, Brazil, polarised light

Structure in a healing fissure in topaz from Brazil

Fire opal, Mexico

Inclusions of hematite in feldspar (sunstone), India

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

Inclusions of gilalite aggregates in rock crystal from Brazil

Two-Phase inclusions and rutile needles in rock crystal from Brazil

Partially etched diamond crystal

Spinel crystal in dolomite marble, Burma