Chrysoberyl (Var: Alexandrite) : BeAl2O4

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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.

> 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

Copyright © J.J. Evans
minID: 4HJ-6HA

Chrysoberyl (Var: Alexandrite) : BeAl2O4

Copyright © J.J. Evans  - This image is copyrighted. Unauthorized reproduction prohibited.

A 3.46ct Alexandrite crystal showining fairly nice "trilling" form, from a classic loaction, infact i think its from this area that Alexandrite was first described from
The colour change wasnt immediately noticeable to my eyes, but the camera showed it easily, but i have since discovered the small bulb from a magnifying lens with a light shows the colour change easily to my eye.
The parent photo shows it green under natural light, infact i had to adjust the image to show any hint of green, the camera cant show it, it comes out a dark blueish grey, but it is infact much greener, even with editing i cannot bring out the true green colour, the area on the top left of the crystal, where the V shaped twining is most sharp is actually almost emerald green, the rest of the crystal is a darker mottled green.
The child photo shows the purple/red colour in incandescent light
Crystal is approx 1cm wide

This photo has been shown 1284 times
Photo added:27th Jun 2009
Dimensions:1553x1201px (1.87 megapixels)
Date/Time of Photo:21st Jul 2009 02:47:44
Camera:CANON PowerShot A630
Exposure time:1/0s
Focal Length:7mm

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