Miarolitic cavities in Drammens granite close to the contact with cambrosilurian sediments altered to hornfels. Many cavities were exposed during a period of development in the 1970s.
References:
- Eldjarn, K. (1994): Uvitt-dravitt fra Borgenåsen, Asker. STEIN 21 (2), 148-151
Mineral List:12 entries listed. 8 valid minerals.
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