Abstract
Abstract The kimberlite dikes in the Kalix-Lulea archipelago, carlier described by Geijer and W. Larsson, have their content of olivine replaced by serpentine etc. A kimberlite boulder from this area that was handed over for examination in 1948, contained however fresh olivine in abundance. The Li-bearing mica cryophyllite was noticed in the groundmass of this kimberlite.
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