Secondary mineral in the oxidation zone of some copper deposits, formed by the alteration of arsenopyrite or enargite.
IMA Status:
Approved IMA 1964
Locality:
Hingston Down Consols mine, Calstock, Cornwall, England. Link to MinDat.org Location Data.
Name Origin:
Named for Sir Arthur Edward Ian Montagu Russell (1878-1964) and Arthur William Gerald Kingsbury (1906-1968) for their contributions to British mineralogy.
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Keller P , Hess H , Neues Jahrbuch fur Mineralogie, Abhandlungen , 133 (1978) p.291-302, Die kristallstruktur von arthurit, CuFe2[(H2O)4|(OH)2|(AsO4)2]
Physical Properties of Arthurite
Cleavage:
None
Color:
Apple green, Emerald green.
Density:
3.02
Diaphaneity:
Transparent
Fracture:
Brittle - Generally displayed by glasses and most non-metallic minerals.
Habit:
Acicular - Occurs as needle-like crystals.
Habit:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Habit:
Spherical - Spherical, rounded aggregates.
Hardness:
3-4 - Calcite-Fluorite
Luster:
Vitreous (Glassy)
Streak:
light green
Optical Properties of Arthurite
Gladstone-Dale:
CI meas= -0.061 (Fair) - where the CI = (1-KPDmeas/KC) CI calc= 0.024 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2336,KPDmeas= 0.2538,KC= 0.2393 Ncalc = 1.72 - 1.78