IMA 2008-063 = kolitschite

Mills, S. J., Grey, I. E., Mumme, W. G., Miyawaki, R., Matsubara, S., Bordet, P., Birch, W. D. & Raudsepp, M. (2008) Kolitschite, Pb[Zn0.5,0.5]Fe3(AsO4)2(OH)6, a new mineral from Broken Hill, New South Wales, Australia, Australian Journal of Mineralogy, 14(2), 63–67.

Abstract

Kolitschite, ideally Pb[Zn0.5,□0.5]Fe3(AsO4)2(OH)6, where □ = vacancy, (IMA 2008–063), is a newly defined mineral from the Kintore opencut, Broken Hill, New South Wales, Australia. Kolitschite occurs as steeply pseudorhombohedral crystals to 0.2 mm associated with mimetite, segnitite, carminite, bayldonite and cryptomelane. The main forms observed are {110} (prism) and {001} (pinacoid). Kolitschite crystals are yellowish green with a light yellow streak and are transparent to translucent with an adamantine lustre. Mohs hardness is 4, no cleavage was observed and all crystals are twinned. Kolitschite is monoclinic, C2/c, with a = 25.8898(6), b = 14.8753(2), c = 12.1700(2) Å, β = 110.681(1)°, V = 4384.9(2) Å3 and Z = 16. Kolitschite crystals are biaxial (+), with estimated indices of refraction n = 2.0. 2V is ≤ 10°. Orientation: Y = b, with straight extinction and very weak pleochroism: X = green to olive green, Y = green to olive green, Z = yellowish green to apple green. Absorption: X ≈ Y > Z. The simplified formula (on the basis of [As+P+S] = 2 and OH- = 6) is: Pb[Zn0.25,□0.75]Fe3[(HAsO4)0.50(AsO4)1.50](OH)6, which requires Zn 2.12, Pb 26.86, Fe 21.72, As 19.42, O 29.03, H 0.85, total 100.00. A solid-solution series extends towards the end-member composition of Pb[Zn0.5,□0.5]Fe3H0.5(AsO4)2(OH)6, with the single-crystal structure giving a charge-balanced empirical formula of Pb[Zn0.439,□0.561]Fe3H0.061(AsO4)2(OH)6. The strongest five powder-diffraction lines [d in Å, (I/Io), (hkl)] are: 3.114, (100), (621, 62-3, 04-2); 6.034, (45), (400, 22-1); 2.280, (37), (404, 22-5); 3.719, (31), (62-1, 040); 2.844, (25), (004). Kolitschite is related to members of the alunite supergroup, in particular segnitite. The mineral is named for Dr Uwe Kolitsch (b. 1966), for his contribution to mineralogy.



Edited 2 time(s). Last edit at 08/17/2009 06:01PM by Stuart Mills.

Congradulations Uwe! =)

Another one up for the mindat management, congrat's Uwe

Congratulations Uwe!!!

Congrats Uwe.

Congratulations Uwe, and very well deserved!

[www.mindat.org]

Congratulations Uwe!

Congratulazioni Uwe!
Una dedica meritatissima!
Marco

What a good decision for a name, congratulations indeed Uwe!!

Congrats Uwe

Congratulations, Uwe. A very much deserved naming of a new mineral from a famous locality.

The name has a nice ring to it, congratulations Uwe! :)

My best congratulations Uwe !
Your competency, devotion and enthusiasm to mineralogy and your constant availability in helping us, amateur mineralogists, well motivate the acknowledgement.

Ciao

Corrado Balestra

A more than well deserved honor. Congratulations Uwe.
Laszlo

Hi all,

It was about time that a man with such a knowledge about minerals is immortisised with a mineral bearing his name.

From the bottom of my heart, Congratulations Uwe. You truly deserve it.

Take care and best regards.

Paul.

Congratulations, Uwe ! About time you got one, and very well deserved ! Keep up the good work you do for the mineralogical community.

Roy

Congratulations Uwe!!!!!

Yay, Uwe!

Well done and well deserved Uwe

Regards,
Ralph