1/1
?

Fahleite : CaZn5Fe3+2(AsO4)6·14H2O

How to use the mindat.org media viewer

Click/touch this help panel to close it.

Welcome to the mindat.org media viewer. Here is a quick guide to some of the options available to you. Different controls are available depending on the type of media being shown (photo, video, animation, 3d image)

Controls - all media types

Zoom in and out of media using your mousewheel or with a two-finger 'resize' action on a touch device.

Use the mouse or your finger to drag the image or the view area of the image around the screen.

< and > at the left and right hand side of the screen move forwards and backwards for the other images associated with the media you selected. Usually this is used for previous/next photo in a gallery, in an article or in search results. Keyboard shortcuts: use shift + the left and right arrow keys.

< and > in the bottom center are used for switching between the photos of the same specimen. Keyboard shortcuts: use the left and right arrow keys.

>  in the bottom center, raises the information box giving details and further options for the media,  <  at the top of this box then hides it. Keyboard shortcuts: use the up and down arrow keys.

? opens this help window. Keyboard shortcuts: use the H key or the ? key.

Other keyboard shortcuts:

1Fit image to screen
2Fill screen with image
5Display at full resolution
<Make background darker
>Make background lighter
spaceHide/dim titles and buttons

Scalebar

If the field of view (FOV) is specified for the photo, the scalebar appears in the left bottom corner of the viewer. The scalebar is draggable and resizeable. Drag the right edge to resize it. Double click will reset the scalebar to it's default size and position. If the scalebar is in default position, double click will make it circular.

Controls - Video

Video files have a standard set of video controls: - Reset to start, - Skip back, - Play, - Pause, - Skip forwards. Keyboard shortcuts: You can stop/start video play with the P key.

Controls - Animation (Spin Rotation)

Animation (usually 360 degree spin rotations) have their own controls: - enable spin mode. Note that while images are loading this option will not be available but will be automatically activated when the animation has loaded. Once active you can spin the image/change the animation by moving your mouse or finger on the image left/right or by pressing the [ or ] keys.

The button switches to move mode so that you can use your mouse/fingers to move the image around the screen as with other media types.

The button, or the P key will start playing the animation directly, you can interrupt this by using the mouse or finger on the image to regain manual movement control.

Controls - 3D Stereoscopic images

If a stereoscopic 3D image is opened in the viewer, the 3D button appears in the bottom right corner giving access to "3D settings" menu. The 3D images can be viewed in several ways:
- without any special equipment using cross-eyed or parallel-eyed method
- with stereoscope
- with anaglyph glasses.
- on a suitable 3D TV or monitor (passive 3D system)

For details about 3D refer to: Mindat manuals: Mindat Media Viewer: 3D

To enable/disable 3D stereo display of a compatible stereo pair image press the 3 key. If the left/right images are reversed on your display (this often happens in full-screen mode) press the 4 key to reverse them.

Controls - photo comparison mode

If a photo with activated comparison mode is opened in the viewer, the button appears in the bottom right corner giving access to "Comparison mode settings" menu.

Several layouts are supported: slider and side by-side comparison with up to 6 photos shown synchronously on the screen. On each of the compared photos a view selector is placed, e.g.:  Longwave UV ▼. It shows the name of currently selected view and allows to select a view for each placeholder.

Summary of all keyboard shortcuts

1Fit image to screen
2Fill screen with image
3Switch to 3D display of stereo pair
4Switch left/right images in 3D mode
5Display at full resolution
<, >Make background darker/lighter
H or ?Show/hide this help page
PPlay/Pause Video or Animation
[, ]Backwards/forwards one frame (Animation only)
spaceHide/dim titles and buttons
up arrowShow information box
down arrowHide information box
left arrowPrevious child photo
right arrowNext child photo
shift + left arrowPrevious image on the page
shift + right arrowNext image on the page


 
 
 
 
minID: LMQ-GK2

Fahleite : CaZn5Fe3+2(AsO4)6·14H2O

This image is copyrighted. Unauthorized reproduction prohibited.

A mounted and analysed (Microprobe and IR) fragment of green Fahleite to 1mm. Unfortunately it's very dificult to photograph.
Anaylsis by and sample from Steffen Moeckel.

[Most probably incorrect ID - for discussion see https://www.mindat.org/mesg-106-444989.html]

Photo and Specimen Liam Schofield

This photo has been shown 826 times
Photo added:19th Apr 2013
Dimensions:640x480px (0.31 megapixels)

Data Identifiers

Mindat Photo ID:529465 📋 (quote this with any query about this photo)
Long-form Identifier:mindat:1:4:529465:4 📋
GUID:a37b0b24-c3f8-4502-853f-63ca14b41c6a 📋
Specimen MinIDLMQ-GK2 (note: this is not unique to this photo, it is unique to the specimen)

Discuss this Photo

PhotosFahleite - Tsumeb Mine, Tsumeb, Oshikoto Region, Namibia

4th Sep 2018 10:25 UTCRonnie Van Dommelen 🌟 Manager

Yesterday, I traded some email with Tsumeb expert Rolf Fahle. He very kindly sent a picture of the type specimen of fahleite and commented that he doubted that this other image showed fahleite.


I did find this page that mentions the green material:

http://www.tsumeb.com/de/minerals/552/fahheite/


However Rolf countered that the material was always found without matrix, was very complex, and showed a hardness of 4-5, while fahleite is hardness 2.


Should we move this photo or otherwise indicate that it is not certain that this is fahleite?

4th Sep 2018 12:35 UTCMalcolm Southwood 🌟 Expert

Hi Ronnie,

The material in the photograph looks to be a sample of one of the amorphous green gels that occurs at Tsumeb and which have been designated GS1 and GS2 by Gebhard (1999). Compositionally, versions of these gels have yielded analyses very similar to either koritnigite or fahleite, the latter depending, obviously, on the additional presence of calcium and iron.


Unfortunately, some dealers and collectors have seen fit to assign these mineral names purely on the basis of composition.


Critically, however, these gels are amorphous and they produce no x-ray pattern. Since they lack an ordered structure, they should not be described by these mineral names. I would therefore agree with Rolf, that the image you show should not be described as fahleite. (I would disagree with Rolf on one minor point, however, and that is that there are some quite interesting examples of these gels on matrix.)


(As an aside, the late Bill Pinch had some of this material studied closely and it was found that, when heated to 400 degrees Celsius, a koritnigite structure (and x-ray pattern) developed. It was also found that some examples of these green gels contain inclusions of the rare minerals bradaczekite, ianbruceite, and a blue variety of legrandite (provisionally identified), all of which makes these gels well worth studying.)


Hope this helps.

mal

4th Sep 2018 16:03 UTCUwe Kolitsch Manager

Message sent.


It says "Anaylsis by and sample from Steffen Moeckel."

I wonder what kind of technique was used.

4th Sep 2018 16:30 UTCAlfredo Petrov Manager

Caption says "Microprobe and IR".

4th Sep 2018 17:06 UTCUwe Kolitsch Manager

Oops, I missed that.

In my opinion IR is insufficient in this case, unless an IR spectrum of a reliably analysed (i.e. also XRD-analysed) sample is used for comparison.

4th Sep 2018 22:22 UTCRonnie Van Dommelen 🌟 Manager

Uwe,

Are you willing to move the photo as required?

5th Sep 2018 11:03 UTCUwe Kolitsch Manager

Sending a message will make photo user-only immediately; unfortunately, the mineral page cache is not cleared automatically ...

Now user-only also manually.

7th Sep 2018 20:48 UTCLiam Schofield

Hi all,


It's one of those specimens I took a punt on based on analysis. With age (And a modicum of wisdom) I have since found the details relating to the GS1 of Gebhard and the unfortunate situation regarding the type of analysis used. As mention, I am now aware that basic analytical techniques aren't sufficient in this case and suspect you are right that this isn't what it was said to be.


Nevermind; you live and learn.
 
Mineral and/or Locality  
Mindat Discussions Facebook Logo Instagram Logo Discord Logo
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2024, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: April 26, 2024 01:21:14