Mindat Logo
bannerbannerbannerbanner
Welcome!

Schalenblende

Posted by Harjo Neutkens  
avatar Re: Schalenblende
April 18, 2009 10:01PM
    
The Diepenlinchen and Olkusz info is in the article, thanks!
avatar Re: Schalenblende
April 20, 2009 01:46PM
    
Harjo,
Diepenlinchen description had to be updated again, i missed some important details ..
Will get pictures of Stolberg Schalenblende these days - i consider these the best Henriette specimens i know from the Friedrich Holtz collection (Stolberg).
Breinigerberg, Hammerberg etc. description will follow also,
cheers
Roger
NH
Re: Schalenblende
April 20, 2009 03:28PM
Out of curiosity, are there any notable localities outside of Europe (other than Broken Hill as Ralph mentioned)? If not, any reason why not? On the schalenblende page, mindat lists a Bolivian locality and a US locality, but neither has any pictures that look like schalenblende. Lead-zinc deposits are pretty common, but schalenblende doesn't seem to be outside of Europe...

Thanks
avatar Re: Schalenblende
April 20, 2009 04:03PM
    
The reason why is that we tend to call them colloform specimens instead of schalenblende. They are relatively common in mississippi valley type deposits (West Fork mine, Missouri; Pine Point in Canada).
avatar Re: Schalenblende
April 20, 2009 07:16PM
    
David is right,
there is a lot of Schalenblende outside of Europe .. but the term 'Schalenblende' is german and not that widely used on colloform sphalerite samples. As i wrote earlier, some MVT deposits as for instance Polaris mine in Canada has Schalenblende as major part of the ore. The reason may be also that the european specimens show the nicest banding so they were cut and polished very early by collectors. By the way .. the Aachen-Stolberg deposits are considered to be similar to Mississipi Valley Type ... and besides Olkusz, Poland they are the most important deposits that yielded excellent Schalenblende specimens.

Cheers
Roger
avatar Re: Schalenblende
April 20, 2009 08:23PM
    
Thanks Roger, I was absent (concerts,....work) for a couple of days.
avatar Re: Schalenblende
April 21, 2009 12:49AM
Roger, Those are good observations and I don't doubt that they will find their way into the article.

Rock Currier
Crystals not pistols.
avatar Re: Schalenblende
April 21, 2009 12:56AM
    
Some notes:

- Another prolific Polish Schalenblende locality is the Biały Szarlej mine.
- The Schalenblende from Wiesloch contains lead sulfosalts in addition to galena, sphalerite and wurtzite. The most abundant of these is jordanite.
- Pavel Kartashov did recently upload a couple of dzhalindite photos. The matrix also classifies as schalenblende.

And finally, a gel is not a colloidal dispersion! If Wikipedia says so, it's just another big mistake.



Edited 1 time(s). Last edit at 04/21/2009 01:19AM by Peter Haas.
avatar Re: Schalenblende
April 21, 2009 06:04PM
    
some more notes ...
Gussone (1964) and Redecke (1991) postulate the formation of the Aachen Stolberg Schalenblende to have occured from epithermal oversaturated solutions with fast precipitation. Colour changes of the Blende are related to changing iron content but also to size of the crystallites .. the smaller the brighter the layers (and the faster the precipitation). I did some (unpublished) electron micropobe tests some years ago and Gussone published his results in his PhD thesis. See references at the Diepenlinchen locality description.

cheers
Roger



Edited 1 time(s). Last edit at 04/22/2009 07:39AM by Roger Lang.
avatar Re: Schalenblende
April 21, 2009 06:54PM
    
Bleischarley and Wiesloch both produced Jordanite in the eyes in the schalenblende. It is the grey mineral with no cubic cleavage (ie not GaIena). In addition Hutchinsonite occurs in the Jordanite from Wiesloch. It is black with red internal lights These are rare old pieces with the sulfosalts rarely recognized.on the labels.

Pine Point also produced good schalenblende, similar to the Belgian material with no sulfosalts. Very few specimens from Pine Point were saved.

This is a great article and a further deviation from Rock's original desire to treat only species. From his comments, Rock seems very happy with this.
avatar Re: Schalenblende
April 21, 2009 07:20PM
Yes, I am happy.

Rock Currier
Crystals not pistols.
avatar Re: Schalenblende
April 23, 2009 01:18PM
    
Hello,

Nice article.

I could contribute a little to the Silbereckle Locality. It's Silbereckle Mine, Felgendobel creek, Gereuth, Reichenbach near Lahr, Black Forest, Germany. This location has produced some samples of Schalenblende, mostly consisting of banded greyish to yellowish brown sphalerite with minor wurtzite. Pyrite/marcasite is not common at the Reichenbach localities at all. Typically it is accompanied by grey chert-like quartz and white to pale greyish or brownish baryte as dense, earthy aggregates without tabular forms. Jordanite (pseudomorphs after gratonite), mostly pseudomorphed by mimetite is present at one sample. I have one small part of the sample, showing black to gray jordanite at sphalerite and baryte. I this vein, native arsenic is another typical ore mineral as well as the main ore, galena. Secondary minerals include adamite and köttigite, both as very nice xls.

The vein is part of a larger vein system in a fault zone, striking NE-SW (parallel to the main fault system of the Upper Rhine Graben). It is tertiary in age as well as the main fault zone, parallel to the eastern flank of the main fault zone (Schwarzwaldrandverwerfung). The vein goes to the south to the Michael Mine (type locality of hallimondite, hügelite, the first descriptions of a Zn-Fe-arsenate (later described from Tsumeb as Tsumcorite) and Weilerite (SO4-rich Arsenogorceixite) have been made there). But interestingly the Silbereckle Mine is the only known location in the Black Forest that has Schalenblende.

The vein zone to the north has triassic sediments and proterozoic gneisses, to the south granite of variscian ages and gneisses.

Regards,
Sebastian Möller
Re: Schalenblende
April 23, 2009 02:06PM
The Cadjebut Mine in Western Australia has a banded, colloform sphalereite with galena which could be considered schalenblende.

Frank
avatar Re: Schalenblende
April 24, 2009 10:45AM
    
Seb, I've put your info on Silbereckle in the article.
Frank, could you suply photographs of Schalenblende from Cadjebut?
Peter, are you sure the matrix of the Dzhalindite is Schalenblende, or could it be banded Cassiterite (Wood-Tin)
I removed the "colloidal dispersion" in the caption, I copied it from the Mindat Schalenblende page, shall I remove it there also?



Edited 3 time(s). Last edit at 04/24/2009 12:41PM by Harjo Neutkens.
erik vercammen
Re: Schalenblende
April 24, 2009 07:56PM
From the book "Les minéraux de Belgique 2" , the text about wurtzite:

" La "schalenblende" de la région de Moresnet est un agrégat de sphalérite et de wurtzite (Noelting, 1887)en couches alyternantes foncées et claires, disposées en écailles (Kutina, 1953). Selon ce dernier, la masse de ZnS s'est déposée sous forme colloïdale, sauf autour des cristaux de galène ou le dépôt s'est fait à partir de solutions vraies. L'examen spectrographique montre que les parties foncées contiennent plus de Fe et aussi de Ge, Mn, Pb, As, Tl, les parties claires étant plus riche en Zn et Cd."

Aan Harjo: in dit boek staat nog veel meer, o.a. over het speciale verschijnsel van de "galène tricotée" in sommige Belgische schalenblende. Contacteer me misschien rechtstreeks op mijn email erikvercammen@fulladsl.be, om te overleggen hoe dit verder te gebruiken en mee te werken.
avatar Re: Schalenblende
April 24, 2009 08:29PM
    
I'm sorry, but this is wrong either.

From a colloidal solution (a so-called sol), the dispersed matter precipitates to form a gel. This process is termed coagulation, its inverse process is termed peptisation. Hence, when the matter stays dispersed in the liquid phase, it is a colloid, but once it precipitates, it becomes a gel which may further solidify or not. This is not only a matter of nomenclature, but also has important physico-chemical implications: both phases, sol and gel, have different properties.

The term "colloidal dispersion" is a pleonasm. A colloidal phase is necessarily dispersed.
avatar Re: Schalenblende
April 24, 2009 09:21PM
    
Erik and Peter, you both got a message winking smiley
avatar Re: Schalenblende
April 25, 2009 07:35AM
    
Harjo, you're right about the dzhalindites. It's wood tin, not schalenblende. Association of indium with tin makes definitely more sense.
Sorry for misleading you.
avatar Re: Schalenblende
April 25, 2009 08:47AM
    
No problem Peter, have you thought about my question (or desperate need for help winking smiley )?
avatar Re: Schalenblende
April 30, 2009 11:42AM
    
Hello,

Here are two pieces from Silbereckle Mine, Reichenbach, Lahr, Black Forest, Germany from my collection:

1. breccia with schalenblende (brown) and baryte (white) in grey chert size approx. 5x7 cm

2. massive Schalenblende (approx. 5 cm). Both specimens Sebastian Möller collection. Bought from the finder, Mr. H. Schmeltzer.

Regards,
Sebastian Möller
Attachments:
open | download - PICT0001.JPG (608.6 KB)
open | download - PICT0006.JPG (504.6 KB)
Author:

Subject:


Attachments:
  • Valid attachments: jpg, gif, png, pdf
  • No file can be larger than 1000 KB
  • 3 more file(s) can be attached to this message

Spam prevention:
Please, enter the code that you see below in the input field. This is for blocking bots that try to post this form automatically. If the code is hard to read, then just try to guess it right. If you enter the wrong code, a new image is created and you get another chance to enter it right.
CAPTCHA
Message:
Mineral and/or Locality  
Search Google  
Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
Current server date and time: October 31, 2014 21:40:39
Mineral and Locality Search
Mineral:
and/or Locality:
Options
Fade toolbar when not in focusFix toolbar to bottom of page
Hide Social Media Links
Slideshow frame delay seconds
New Mineral Name: 赤路矿From Peter Haas, 31st Oct 2014 21:40:15