| References: | Petersen Ole V.,Secher K.(1985) - Gronland: Mineralien, Geologie, Geschichte. - Verlag Bode & Partner K.G., Bochum, 87 pagg; Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 292. |