Search Mineralpedia – A Mineral Photo Database and Identification Guide
Vajdakite (IMA No. 1998–031) is named after Josef Vajdak of Pequa Rare Minerals, Massapequa, New York, USA, in recognition of his significant contributions to mineralogical research on the Jáchymov ore district. Vajdakite is a monoclinic molybdenum bearing arsenide which occurs in veins associated with arsenic, scorodite, annabergite, nickelskutterudite, löllingite, and köttigite.
For more information see http://rruff.info/rruff_1.0/uploads/CM41_1309.pdf
A relatively common mineral, Vanadinite is named for its vanadium content. It is found in many localities worldwide as a secondary mineral in oxidized lead-bearing deposits as the vanadium is leached from the wall-rock. Vanadinite was discovered even prior to the discovery in vanadium in Mexico at its type locality of Zimapán, Mexico. Interestingly, the type material for vanadinite was lost at sea.
Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/vanadinite.pdf
Named for the vanadium in the composition and for its relationship to carpholite. It is a rare mineral that occurs only in Italy at the Molinello mine, the type locality, and the Valgraveglia mine, both in Liguria. It occurs at the type locality in thin veins and open fissures in a silicified wood sample from manganese-ore bearing cherts. It appears as honey yellow to brown to pale straw yellow aggregates of acicular crystals that are associated with volborthite and quartz.
Ref. Basso, R., et al. and the European Journal of Mineralogy May, June 2005 v. 17 no. 3 p. 501-507
Named to honor Dr. Rene Van Tassel, who did extensive mineralogical research on Belgian minerals and was a mineralogist at the Royal Institute of Natural Sciences in Brussles, Belgium. Vantasselite is found on dumps from a quartzite quarry within quartz veinlets and along schistosity planes. Type locality is Bihain, Belgium, but also found in Germany and Japan.
Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/vantasselite.pdf