Greenwoodite
The second new mineral from British Columbia's Wigwam deposit — a barium-vanadium silicate related to zoltaiite.
Intro adapted from Wikipedia (CC BY-SA).
Greenwoodite is an IMA-recognized mineral species in the silicate class, with the chemical formula Ba₂₋ₓ(V³⁺OH)ₓV³⁺₉(Fe³⁺,Fe²⁺)₂Si₂O₂₂.
It crystallizes in the hexagonal crystal system (space group P-3m1).
Key properties: Mohs hardness 5; specific gravity 4.81; Semi-metallic, dull luster.
IMA symbol Gwd, IMA status: approved, named in 2010.
Part of the prograde assemblage in a green schist facies metamorphosed Mississippi-Valley type base-metal deposit.
It is found associated with Quartz, celsian, apatite, sphalerite, pyrrhotite, galena, pyrite, zoltaiite, batisivite.
The mineral was named to honor Professor Hugh J. Greenwood (b. 1931), former head of the Geological Sciences Department, University of British Columbia, Vancouver, British Columbia, Canada.