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Volborthite

Named for Alexander Fedorovich von Volborth, the Russian paleontologist who first observed the mineral. Volborthite is an uncommon secondary mineral that is found in oxidized zones of hydrothermal Vanadium-bearing deposits and is associated with brochantite and malachite, among others. Despite its uncommonness, Volborthite can be found in many localities worldwide.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/volborthite.pdf

Vuoriyarvite-K

Named for the type locality at the Vuoriyarvi massif in the Kola Peninsula in Russia. The only other localities for Vuoriyarvite are also in Russia in the Lovozero and Khibiny massifs, also in the Kola Peninsula. It is found at the type locality as a product of the alteration of pyrochlore during hydrothermal dolomitization of carbonatites, and is associated with apatite, strontianite, ewaldite, and sulfides. It appears as white, translucent tabular crystals.

Ref. Minerals and their Localities, Bernard, J.H. and Hyršl, J. (2004)

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