The locality is a 1-1.5 m wide calcite/pyrolusite vein cutting through granitic gneiss and amphibolities. In the period between 1917-19 the vein was followed 137 m underground. Today, a number of minerals, predominantly microminerals, has been identified.
This locality has often been mislabelled just "Ålefjær", the correct one should be Kivikdalen (Breivik et al. 2007).
Refs.:
- Bugge C. (1920) Manganforekomstene i Tveit og Vennesla. Bergarkivet Norges Geologiske Undersøkelse, Rapport nr. 81.
- Breivik, H. ; Myre, K. & Larsen, A. O. (2007): Manganforekomster på Sørlandet: Kvivikdalen (Kostøl, Ålefjær): Bergverksmuseets Skrift nr 35, 25-31
