“Gem of the Kola Land” – that is how Kovdor is referred to in this book, and that is what, given the choice, I would have included in its title. The Kovdor intrusive complex in the Kola Alkaline Province, in northwestern Russia, is in every sense of that word, a gem. It is a place where some 400 million years ago, various types of exotic magmas from the Earth’s mantle stalled in the crust, forming a fantastic kaleidoscope of ultramafic, alkaline, carbonatitic and “cross-bred” metasomatic rocks. This petrographic assemblage is so well endowed with mineral resources that, at one time,...

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