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ATHENA

MINERALOGY

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Mineral:AGATE = Layered CHALCEDONY
References:Rykart (1989)

Quartz "Agate", Brasil
The picture shows the infiltration's canal
with the successive chalcedony layers with more or less iron oxides.
Photo and coll. P. Perroud
See also: athena.unige.ch -> mineral pictures

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