Found in brecciated silicified rhyolitic and dacitic pyroclastic rocks. The Fe+++ dominant analog of winstanleyite.
IMA Status:
Approved IMA 1996 (Dana # Added)
Locality:
Wendy open pit of the Tambo mine, El Indio � Tambo mining property, 160 km east of La Serena, Cquimbo Province, northern Chile. Link to MinDat.org Location Data.
Name Origin:
Named after Phillip Walford (b. 1945), of Toronto, Ontario, Canada, Vice-President and Chief Geologist of LAC Minerals, Ltd., at the time that mining company held the mining rights to the discovery locality.