A granite pegmatite.
More than 100 kg of fergusonite-(Y) mostly masses of several kg was found here in the 1880's.
References:
Brøgger, W.C. (1906): Die Mineralien der südnorwegischen granitpegmatitgänge. I. Niobate, tantalate, titantate und titanoniobate. Videnskabs-Selskabets Skrifter. Math.-Naturv. Klasse 1906. No. 6, 162 p
Mineral List:10 entries listed. 7 valid minerals.
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