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The Lierbachtal Valley, near to the village Oppenau, was offering best conditions for the rockhounding on lithophysae. Because of devastations made by  collectors at the finding locations, no more digging or  collecting is allowed from the farmers on classical locations, such as the well known “Holzplatz”. Only housebuilding operations or road construction work are offering new findings. The lithophysae do occur in quartz-porphyric rocks, situated in a wheathered greyish-white soil. Their shape is globular to discoidal with an irregular skin, often decorated by little globes. They are presenting different structures and agate-types in their center:

- concentrical oriented sickle-shaped cells following the shape of the lithophysae are distinctive for the location.

- Sometimes several lithophysae are building a chain-shaped aggregation.

- Besides multicoloured fortification-agate a greenish not banded chalcedony is occuring (Prasem).

- Fortification-agates are occuring in combination with “water-level-agates”.

- Polygonal fillings of banded agate between thin linear borders are presenting pseudomorphic formations after thin calcite- or barite-crystals.