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Mineralogical ClassificationRedgillite published

26th Jan 2006 13:15 UTCJim Ferraiolo

Redgillite (IMA 2004-032) abstract:

<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

Now also known from 10 different localities in Germany:


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

I have already added the half dozen or so mid-Wales locations. I would be interested in seeing the Aufschluss artical. Where can can I obtain it ?.


Cheers

Steve Rust

28th Jan 2006 01:20 UTCJim Ferraiolo

If anyone has either or both articles, I'd appreciate a copy or a PDF of them.


Thanks.

30th Jan 2006 11:38 UTCPeter Haas

Updated.

1st Feb 2006 11:20 UTCErnst A.J. Burke

Redgillite is NOT 2004-032, BUT 2004-016!

2nd Feb 2006 01:54 UTCj.ferraiolo

Sorry about that!


Jim Ferraiolo

16th May 2006 17:05 UTCChris Stanley

Interesting this. If my memory serves me correctly, it is the bright green "unknown copper sulphate hydrate" Mick Cooper and I illustrated back in 1990 from a P.Braithwaite specimen in "Minerals of the English Lake District: Caldbeck Fells" page 133


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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