Chalcedony (Var: Carnelian) : SiO2

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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

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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.

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Other keyboard shortcuts:

1Fit image to screen
2Fill screen with image
5Display at full resolution
<Make background darker
>Make background lighter
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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: 95Q-EKH

Chalcedony (Var: Carnelian) : SiO2

This image is copyrighted. Unauthorized reproduction prohibited.
Dimensions: 80 mm x 70 mm x 35 mm
Weight: 265 g

This red hot coal is an excellent natural pebble of fully transparent carnelian. The size is 8 x 7 x 3,5 centimeters and it weights 265 gram or a half pound.

The picture has been taken under artificial light and the color is not modified (RAW-Image). The color has not been distorted by this source of light and the color of transmitted daylight looks identical.

It is a natural pebble, which has not been treated or modified in any kind. It has not been cut or polished. All patterns of fine cracks and other surface features are preserved. It is almost perfect and has just one 1,5 x 0,5 cm cm internal crack on the backside (near the rim at the right side of the top, not visible in this picture). It has no banding and a almost uniform structure. This uniform appearance in combination with the light transmitting properties of the chalcedony give this carnelian an unrealistic and artificial look. The bright "internal reflections" on the sides are actually caused by the light transmission along the fibres of the of the chalcedony.

This Photo was Mindat.org Photo of the Day - 9th Nov 2017

This photo has been shown 885 times
Photo added:15th Sep 2013
Dimensions:1001x900px (0.90 megapixels)
Date/Time of Photo:13th Sep 2013 22:17:28
Camera:CANON EOS 350D / Digital Rebel XT / Kiss Digital N
Exposure time:1/100s
Focal Length:54mm
ISO speed:800

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