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Mineralogical ClassificationRedgillite published
26th Jan 2006 13:15 UTCJim Ferraiolo
<06M/0382> Redgillite, Cu6(OH)10(SO4)• H2O, a new mineral from Caldbeck Fells, Cumbria, England: description and crystal structure. J. J. Pluth, I. M. Steele, A. R. Kampf & D. I. Green, Mineralogical Magazine, 69(6), 2005, pp 973–980.
Redgillite occurs in Silver Gill, Caldbeck Fells, Cumbria, as translucent to transparent grass-green bladed crystals up to 0.15 mm long with squared-off or tapering terminations; usually in radiating groups associated with langite in thin fractures in partly oxidized sulphides. It has a vitreous lustre and perfect {001} cleavage and good {100} and {010} cleavages; H. ~ 2, D 3.45 g/cm3; a(blue-green) 1.693, b(blue-green) 1.721, g(yellow green) 1.723, 2Va 30°, dispersion r >v, medium; orientation a ~ c, b = b, g ~ a. EPMA gave CuO 68.9, SO3 11.6, = 80.5; with water inferred from the structural analysis, the ideal formula is Cu6(OH)10(SO4)• H2O. Indexed XRD powder data are tabulated; strongest lines 7.11(100), 9.72(90), 2.318(50), 4.60(30), 2.880(30), 4.068(20) Å; a 3.155, b 10.441, c 19.436 Å, b 90.089°, V 640.2 Å3, Z = 2, space group P21/c. The crystal structure was determined and refined to R 0.090; it consists of Jahn-Teller distorted CuO6 octahedra and SO4 tetrahedra. The octahedra share edges to form sheets that are zig-zag in cross-section. The SO4 tetrahedra share an oxygen with the Cu layer and link the layers by hydogen bonds to OH groups. Silver Gill is the type locality, but the name redgillite is retained for this mineral in recognition of its best known ocurrence at Red Gill (less than 1 km from Silver Gill).
27th Jan 2006 17:14 UTCUwe Kolitsch Manager
Schnorrer, G., Pfeiffer, F. & Schwarz, L. (2006): Redgillit – ein neues Cu-Sulfatmineral von zehn Fundstellen aus Deutschland. Aufschluss, 57, 15-22. (in German)
Haven't read article yet, so I can't enter these localities in the database.
Uwe Kolitsch
27th Jan 2006 20:08 UTCSteve Rust Manager
Cheers
Steve Rust
28th Jan 2006 01:20 UTCJim Ferraiolo
Thanks.
30th Jan 2006 11:38 UTCPeter Haas
1st Feb 2006 11:20 UTCErnst A.J. Burke
2nd Feb 2006 01:54 UTCj.ferraiolo
Jim Ferraiolo
16th May 2006 17:05 UTCChris Stanley
At the time the powder pattern suggested it was a member of the ojuelaite-whitmoreite-arthurite group although the formula now assigned seems to suggest this is not the case. Any comments?
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