Inclusions of anatase crystal and rutile fibres in rock crystal from Brazil
Fire opal, Mexico
Inclusion of apatite in ruby from Tanzania
Colour zoning in ruby from Mong-Shu, Burma
Natural etching structure on a crystal face of diamond (trigons), polarised light
Stress fissure («sun spangle») in baltic amber
Inclusions of gilalite aggregates in rock crystal from Brazil
Fluid inclusions in quartz with bituminous daughter minerals, China

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