Calcite : CaCO3, Chalcopyrite : CuFeS2

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 for further 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

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

Stereoscopic 3D image viewing requires a suitable 3D television or monitor correctly configured for your computer. Passive 3D systems such as LG 3DTVs are the easiest to configure for this.

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.

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)
up arrowShow information box
down arrowHide information box
left arrowPrevious image/media page
right arrowNext image/media page
spaceHide/dim titles and buttons

minID: YXD-A1H

Calcite : CaCO3, Chalcopyrite : CuFeS2

This image has been released to the public domain and may be used freely.
Dimensions: 53 cm x 13 cm x 12 cm

A large almost 20-inch double terminated calcite cluster from the "Black Calcite" pocket (unofficial name, I think). This specimen has very minimal damage considering the effort it must have taken to get out. Toward the underside of the specimen the crystals become a little more transparent revealing phantoms and trapped chalcopyrite crystals. This is a truly spectacular discovery at Sweetwater and the specimens resemble in some ways the gray calcites from Brushy Creek Mine in the 1990s. Having seen several pieces from the find, I've noticed many have this heavy parallel growth and "wheat sheaf" arrangement, not dissimilar to the way crystals clustered in specimens from around 2012-2014, but with sharp terminations instead. Some have described them as looking like "dragon scales." Occasionally, as in this piece, there is a well-defined scalenohedron without as much parallel growth. These scalenohedrons often have flattened "chisel-like" terminations. The last thing of note in many of these specimens is the relative dark opacity of one side of the crystal and transparency and luster on the other side. It's not quite selective etching as there is luster on all sides, but perhaps selective deposition of the dark inclusions. I am not sure if this had something to do with the orientation of specimens in the pocket. Lastly, I have noticed some of the specimens have rich yellow color noticeable in the transparent areas.

Collected: 2019

This photo has been shown 64 times
Photo added:5th Jan 2020
Dimensions:2022x3197px (6.46 megapixels)
Date/Time of Photo:11th Dec 2019 19:13:47
Camera:APPLE iPhone 6
Lens:iPhone 6 back camera 4.15mm f/2.2
Exposure time:1/30s
Focal Length:4mm
Focal Length (35mm film equivalent):29mm
ISO speed:125
矿物 and/or 产地  
版权所有© mindat.org1993年至2020年,除了规定的地方。 Mindat.org全赖于全球数千个以上成员和支持者们的参与。
隐私政策 - 条款和条款细则 - 联络我们 Current server date and time: 2020.2.28 15:45:22