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Improving Mindat.orgJacquesdietrichite - missing xl data

4th Nov 2006 15:19 UTCAlan Plante

There is no crystallographic data given for this species - nor any indication that it is amorphous. I presume the info just didn't get added to the page?

If it's available, could someone please enter at least the Crystal System, Class, and Space Group?

See: Eur. Jour. Min., 14, 361 (2004) and/or(?) 16, 361 (2006) -

Thanks

Alan

4th Nov 2006 17:08 UTCMarco E. Ciriotti Manager

The crystallographic data of jacquesdietrichite are:

orth Pnma 9.455 5.866 8.668

Reference

Kampf, A.R. & Favreau, G. (2004): Jacquesdietrichite, Cu2(OH)3, a new mineral from the Tachgagalt mine, Morocco: Description and crystal structure. European Journal of Mineralogy, 16, 361-366.

Abstract:

Jacquesdietrichite, Cu2(OH)3, space group Pnma, a = 9.455(2), b = 5.866(2), c = 8.668(2) Ã…, V = 480.8 Ã…3, Z = 4, is a new mineral from the Tachgagalt mine, Morocco. The strongest eight lines of the X-ray powder-diffraction pattern are: 4.734 (100) (200), 3.941 (90) (102), 3.192 (40) (202), 2.545 (45) (302), 2.489 (50) (220), 1.922 (50) (322), 1.838 (40) (420), 1.712 (40) (124). It occurs as transparent bright-blue blades, sometimes intergrown into broader tablets, and as aggregates of pale-blue scales. It is found in small cavities in gaudefroyite-calcite rock and as inclusions in calcite. Blades do not exceed 0.5 mm in length and 0.02 mm in thickness (parallel to {001}), and often taper somewhat in thickness from tip to base. The forms in order of prominence are {001}, {100} and {010}. The streak is pale blue, the luster is vitreous and the hardness is about 2. Blades are slightly flexible with irregular fracture and exhibit a perfect and very easy {100} cleavage and good {010} and {001} cleavages. The measured density (by sink-float) is 3.28(5) g/cm3; the calculated density is 3.303 g/cm3. The mineral dissolves quickly in dilute HCl. Electron microprobe analyses yielded CuO 72.68, CaO 0.11, SiO2 1.00, B2O3 (calc.) <14.57>, H2O (calc.) <18.85>, total 107.21 wt%. CaO and SiO2 are considered to be from impurities and the high total to be due to volatilization. Jacquesdietrichite is biaxial (-) with Î± = 1.627(2), Î² = 1.699(2), Î³ = 1.769(2), 2V (calc.) = 86Â°, strong pleochroism: X (deep blue) > Y (medium blue) > Z (pale blue); orientation: X = a, Y = c , Z = b. The name honors Jacques Emile Dietrich, Ph.D., of Nice, France (born 1926), retired geologist/mineralogist (Chief Geologist-Autonomous Corps of Geologists of Overseas French Territories) who worked extensively in Morocco. Dr. Dietrich discovered the new mineral. The crystal structure of jacquesdietrichite was solved by direct methods and refined by full-matrix least-squares techniques to R = 6.57% for 295 observed reflections 4Ïƒ(Fo)>. Difference maps allowed the approximate location of all hydrogens. CuO6 octahedra form trans edge-sharing (rutile-like) chains parallel to <010>. The CuO6 octahedra exhibit typical Jahn-Teller distortion with lengthened Cu-O bonds corresponding to the trans apical vertices that do not participate in the octahedral edge-sharing. The octahedral chains are joined into layers parallel to (100) by sharing the apical octahedral vertices in the <001> direction. Triangular BO(OH)2 groups link the octahedral layers in the <100> direction yielding a framework structure. Jacquesdietrichite is the only known mineral containing the BO(OH)2 group and its structure is not closely related to any other known borate mineral. In the structural hierarchy of copper-oxysalt minerals, jacquesdietrichite has an M=M-T framework structure, but the structure is not topologically similar to that of any known copper-oxysalt mineral.

4th Nov 2006 17:12 UTCJean-Marc Johannet Manager

Additional reference:

FAVREAU G. & DIETRICH J.E. (2006) Tachgagalt (Maroc) Le Cahier des Micromonteurs, 93, 37-71. (in French)

I'm going to update Tachgagalt data page this evening.

5th Nov 2006 00:10 UTCJim Ferraiolo

Updated.

5th Nov 2006 03:37 UTCAlan Plante

And thanks once again to the team! :~} - Alan

5th Nov 2006 07:55 UTCJean-Marc Johannet Manager

Jim,

There is still a lot of mispellings in reference given on Jacquesdietrichite page.

Kampf, A.K. & G. Favreau: "Jacquesdietrichite, a new mineral from the Tachgagait mine, Morocco: description and crystal structure: European Journal of Mineralogy (2004): 14: 361-366.

should be

Kampf, A.R. & Favreau, G. (2004): Jacquesdietrichite, Cu2(OH)3, a new mineral from the Tachgagalt mine, Morocco: Description and crystal structure. European Journal of Mineralogy, 16, 361-366.

5th Nov 2006 10:46 UTCMarco E. Ciriotti Manager

Corrected Jean-Marc. Thanks.

Ciao.

Marco

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