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In close proximity to Lokken Verk a  big jasper-vein is included in ophiolithes. Its iron-content ( in form of the mineral hematite ) reaches up to 15 per cent. In the environment of Lokken Verk also pebbles of jasper can be found, which were enriched alluvial by the water.

Tor Grenne and John F. Slack wrote this article about this type of jasper : Geochemistry of Jasper Beds from the Ordovician Lkken Ophiolite, Norway: Origin of Proximal and Distal Siliceous Exhalites