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Botryoidal Chalcedony

$20.00

This listing is for the exact specimen shown. 

Weight: 115g

WHAT IS IT

Chalcedony is a cryptocrystalline form of silica, composed of very fine inter-growths of quartz and moganite. These are both silica minerals, but they differ in that quartz has a trigonal crystal structure, while moganite is monoclinic. Chalcedony's standard chemical structure is SiO₂.

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