587
The Canadian Mineralogist Vol. 49, pp. 587-594 (2011) DOI : 10.3749/canmin.49.2.587
FERROERICSSONITE, THE Fe2+ ANALOGUE OF ERICSSONITE, FROM EASTERN FRESNO COUNTY, CALIFORNIA, U.S.A.
ANTHONY R. KAMPF§
Mineral Sciences Department, Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, California 90007, U.S.A.
ANDREW C. ROBERTS AND KATHERINE E. VENANCE
Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada
GAIL E. DUNNING
773 Durshire Way, Sunnyvale, California 94087, U.S.A.
ROBERT E. WALSTROM
P. O. Box 1978, Silver City, New Mexico 88062, U.S.A.
ABSTRACT
2+ 3+ Ferroericssonite, ideally BaFe 2Fe (Si2O7)O(OH), is a new mineral species found at both the Esquire #7 and #8 claims, situated along Big Creek in eastern Fresno County, and also at Trumbull Peak in Mariposa County, California, U.S.A. The mineral is the Fe2+ analogue of ericssonite and is named accordingly. Ferroericssonite crystallized very late in a sequence of associated with anandite, bazirite, celsian, devitoite, quartz and titantaramellite. The crystals occur in dark reddish brown foliated !"$$% to [001]. The mineral is transparent and has a brown streak, a vitreous luster, a Mohs hardness of approximately 4½, and two &