Quality of talc from the Nakkan deposit, Altermark, northern Norway
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- Rapporter 
Drill hole samples from the Nakkan-deposit, Altermark, have been investigated with respect to mineralogy and chemistry. In addition a short description of whiteness analysed by Norwegian Talc Altermark is described. In general, the mineralogical investigation confirms earlier field description of the drill holes. The common composition of the talc-carbonate ore is about equal amounts of talc and breunnerite, and small amounts of chlorite and magnetite\/chromite. Locally, and especially along the contact towards serpentinite, serpentine of the type antigorite is present, either in the matrix or as inclusions within breunnerite. Also locally, dolomite may be present. Amphibole of the type anthopyllite is present in parts of the talccarbonate zone. Its occurrence is restricted to definable parts. In the investigated drill holes their occurrence is restricted to the drill holes NAK 9606 (most of the talc bearing unit) and NAK 9604 (small parts). The amphiboles are in many cases fibrous and may there- fore represent a problem if the future mining includes these amphibole bearing talc-carbonate rocks. They should therefore be avoided in the mining plans.