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Blue Agate on stand

Blue Agate on stand.

Agate is a type of chalcedony - a cryptocrystalline variety of silica. Often associated with volcanic activity, it is also found in metamorphic and fossiliferous rock. Agate forms in rock cavities - whether created by bubbles or volatile material in volcanic lava or the decomposition of an item such as a seashell - which fill with molecules of silica over time. Variations in the mineral content result in an array of colors and sometimes create striking banded patterns.

Ø: 17,5 CM
H: 30 CM