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The agate-nodules from Oswaldhoehe are still situated at their place of origin - not fluvial transported like the most agates from Rhine-Hessia.

Very typical for them are inclusions of exactly shaped and big Pyrite crystals (up to 2 cm). Some of the pyrite can be replaced by limonite, but the exact triangular or square shaped inlusions of a metallic substance are easliy to recognize. The agate is showing a weak whitish or red fortification banding.