The Donnersberg area, a famous vulcanic region in Palatinate, is the origin for a very interesting combination between petrified wood and agate. The wood was completly changed into carbon by hot vulcanic ashes  before silification. The wood losses substance and shrinked, so that a lot of fine cleavages did show up. While silification red chalcedony filled up this cleavages. Petrified wood with visible cell structure is very rare at this locations.

Winnweiler 84mmam
Winnweiler 41mmam

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