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.
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Physical Properties of Walfordite
Cleavage:
None
Color:
Orange.
Diaphaneity:
Translucent
Fracture:
Brittle - Generally displayed by glasses and most non-metallic minerals.
Habit:
Crystalline - Fine - Occurs as well-formed fine sized crystals.
Habit:
Microscopic Crystals - Crystals visible only with microscopes.
Luster:
Adamantine
Streak:
orange yellow
Optical Properties of Walfordite
Gladstone-Dale:
CI calc= -1.026 (Poor) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.398,KC= 0.1964 Ncalc = 1.58
Optical Data:
Isotropic, n=2.17.
Calculated Properties of Walfordite
Electron Density:
Bulk Density (Electron Density)=2.53 gm/cc note: Specific Gravity of Walfordite =2.94 gm/cc.
Fermion Index:
Fermion Index = 0.05 Boson Index = 0.95
Photoelectric:
PEWalfordite = 259.14 barns/electron U=PEWalfordite x rElectron Density= 656.88 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Walfordite is Not Radioactive
Chemical Formula: 