A dark green glassy mass of Arrojadite-(KFe). This is an old Minerals Unlimited specimen with label.
Arrojadite was first found at the Nickel Plate mine, near Keystone. It is not known to alter into secondary phosphates. Until the discovery of the phosphorite deposits in the Yukon, Arrojadite was thought to be confined to pegmatites for about 100 years. At the Big Fish River, Yukon Territory, Arrojadite forms beautiful secondary crystals in hydrothermal veins..
The nomenclature of the Arrojadite group, now 14 in number, was changed by the IMA in 2006 based upon the findings of Chopin, Oberti, and Camara in American Mineralogist (2006), pg 1260-1270. As stated in this paper: "Arrojadites are the most chemically complex of primary pegmatite phosphates, and no less than sixteen elements may play a significant role." The authors site this statement from Moore and Ito from a paper on Whiteite in Mineralogical Magazine, 42, 309-323 (1979).