Mineralpedia Details for Ferroericssonite
Named as the Fe2+ analogue of ericssonite. It occurs only at the co-type localities at the Esquire No.7 and Esquire No. 8 claims along Big Creek in California, USA. It crystallizes late in a sequence of minerals that resulted from fluid interaction with quartz-sanbornite veins along the margin of the vein and the country rock. It is associated with anandite, bazirite, celsian, devitoite, quartz, and titantaramellite. It appears as dark red-brown masses composed of irregular, undulating, striated, bladed crystals.
Ref. Kampf, A. R. et al, and The Canadian Mineralogist April 2011 vol. 49 no. 2 587-594
Ferroericssonite from Esquire #8 claim, Big Creek, Fresno Co., California, United States
Deep reddish brown thin platy or foliated masses to 2mm with Gillespite in Quartz-Sanbornite matrix. Originally found by Robert Walstrom and described by Kampf, A.R., Roberts, Venance, Dunning, and Walstrom, in 2010 in Mineralogical Magazine, 74, 797-800.