Dendrites in agate
Twin-crystal of chrysoberyl
Inclusion of apatite in ruby from Tanzania
Structure in a healing fissure in topaz from Brazil
Natural etching structure on a crystal face of diamond (trigons), polarised light
Spinel crystal in dolomite marble, Burma
Two-Phase inclusions and rutile needles in rock crystal from Brazil
Colour zoning in ruby from Mong-Shu, Burma

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