Natural etching structure on a crystal face of diamond (trigons), polarised light
Inclusions of hematite in feldspar (sunstone), India
Agate from Reichweiler, Germany
Spinel crystal in dolomite marble, Burma
Inclusions of gilalite aggregates in rock crystal from Brazil
Inclusions of rutile (dark crystal and fine needles) and clusters of zircon grains in umbalite garnet, Tanzania
Dendrites in agate
Stress fissure («sun spangle») in baltic amber

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