Dendrites in agate
Natural etching structure on a crystal face of diamond (trigons), polarised light
Fluid inclusions containing mica and quartz, in aquamarine from Pakistan
Stress fissure («sun spangle») in baltic amber
Spinel crystal in dolomite marble, Burma
Two-phase inclusions in sapphire, Sri Lanka
Inclusions of hematite in feldspar (sunstone), India
Agate from Anzi, Maroc

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