Massive, with oily or greasy luster (Fatstone, Oilstone), grey to green or blue. Originally reported from the syenite-pegmatite-dykes of the Larvik area, Norway
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(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Brøgger, W.C. (1890): Die Mineralien der Syenitpegmatitgänge der südnorwegischen Augit-und Nephelinsyenite. Zeitschrift für Kristallographie und Mineralogie 16. 663 pp + 28 plates