mineral specimens
rare minerals
mineral dealer
systematic minerals
Black Hills minerals
fine minerals
mineral dealer
Dana minerals
IMA minerals
mineral collections
rock and minerals
gem crystal
0 item @ $0.00  

Arrojadite-(Kfe)

#PD41617

Arrojadite-(Kfe)

#PD41617
Availability
Sold
Size
6.5 x 6 x 5 cm - Sm Cabinet 
Formula
(KNa)Fe2+(CaNa2)Fe2+13Al(PO4)11(PO3OH)(OH)2 (RRUFF)
Locality
Nickel Plate mine, Pennington Co., South Dakota, United States
Tagged
phosphate , pegmatite mineral

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). 

Type Locality

Arrojadite-(KFe)

Formula
(KNa)Fe2+(CaNa2)Fe2+13Al(PO4)11(PO3OH)(OH)2 
Crystal System
Monoclinic 
Class
Monoclinic - Domatic 
Hardness

Data courtesy of Webmineral.

Collection
Phillips Collection
Special Info
Type Locality

All photos by Dakota Matrix and are Copyrighted © and may not be used without permission. Copyright © 2019 - Dakota Matrix Minerals, Inc. Privacy | Terms & Conditions | Site Map