Tetrahedrite Subgroup : Cu6(Cu4 C2+2)Sb4S12S, Siderite ? : FeCO3, Quartz : SiO2

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


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 already in default position, double click will turn it into a circle, which is useful for measuring non-horizontal objects.

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

Copyright © Brian Kosnar - Mineral Classics
minID: 0MQ-2AN

Tetrahedrite Subgroup : Cu6(Cu4 C2+2)Sb4S12S, Siderite ? : FeCO3, Quartz : SiO2

Copyright © Brian Kosnar - Mineral Classics  - This image is copyrighted. Unauthorized reproduction prohibited.
Dimensions: 5.2 cm x 2.7 cm x 1.2 cm

5.2 x 2.7 x 1.2 cm
Largest Crystal 0.7 cm

A beautiful Tetrahedrite specimen from the famous Central City District in Colorado. This area was the site of the first Gold rush in Colorado, and led to Central City being one of the most active communities in Colorado for nearly 40 years after the discovery of Gold. This piece comes from the collection of well-known Denver dealer and mineral collector “Mike” or “Mitch” Gunnell. By my father’s accounts, Gunnell was salty to say the least, but had impeccable taste, and amassed an impressive mineral collection of a few thousand specimens, many from Colorado. Near the end of Gunnell’s life, he started selling off his collection piece by piece, and since my father visited him on a regular basis, he was able to acquire many superb pieces over the years. This piece was purchased in 1979 from Gunnell, and since my father had just recently moved to Gilpin County, he was trying to get his hands on every good specimen from this area. My father told me that Gunnell had a good suite of Gilpin County minerals, and some were the best that he had seen from the area, which included this Tetrahedrite. Many sharp, incredibly well-formed, modified tetrahedral crystals of Tetrahedrite are associated with light golden discs of Siderite on both sides of the piece, and are sitting on minor sugary grey-blue Quartz. Ex. E. M. Gunnell Collection.

This photo has been shown 391 times
Photo added:27th Apr 2013
Dimensions:801x720px (0.58 megapixels)
Date/Time of Photo:21st Jul 2012 15:09:09
Camera:CANON EOS 5D Mark II
Software:Adobe Photoshop CS5 Windows
Exposure time:1/10s
Focal Length:90mm
ISO speed:250

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