Search Mineralpedia – A Mineral Photo Database and Identification Guide

Named for Yves Oscar Fortier, the former director of the Geological Survey of Canada from 1964 to 1972. Found most notably from Mont Saint-Hilaire in Canada and the Lovozero Massif in Russia, Yofortierite occurs as “a late-stage hydrothermal mineral in pegmatite veins” such as at Mont Saint-Hilaire.

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

Named in allusion to its yttrium content in the composition and its relation to tantalite. Occurring as a rare mineral in granitic pegmatites, Yttrotantalite can be found in Sweden, Norway, the USA, and Japan, among others. Yttrotantalite is radioactive and often found as metamict. Can be weakly magnetic.

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

Named for Yukon Territory, the territory in Canada from which it was first found, Yukonite is a secondary mineral that is typically altered from arseopyrite. Found in few localities worldwide, including Canada, USA in New Jersey and Colorado, Germany, and Poland. When fresh, Yukonite may decrepitate, or crackle when exposed to air, water, or heat. This process causes the evolution of carbon dioxide.

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