Quartz (Var: Ametrine) : 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 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 © Brian Kosnar - Mineral Classics
minID: 025-4WC

Quartz (Var: Ametrine) : SiO2

Copyright © Brian Kosnar - Mineral Classics  - This image is copyrighted. Unauthorized reproduction prohibited.
Dimensions: 7 cm x 6.6 cm x 2.8 cm

Specimen Size: 7.0 x 6.6 x 2.8 cm. A polished slice (cross section) of Quartz (var: "Ametrine") showing the alternating zones of rich purple and yellow that exist within these natural bicolor crystals. It should be noted that the purple "Amethyst" portion of the crystals show strong Brazil-law twinning, while the yellow "Citrine" areas do not show any twinning at all. This piece is one of the cleanest, gemmiest and thickest slices that we have seen. It was only one of only a handful of mineral specimens that my father had on display in the house when I was growing up.

Photo by Brian Kosnar. Kosnar Family Collection.

This Photo was Mindat.org Photo of the Day - 12th Feb 2010

This photo has been shown 6079 times
Photo added:4th Jun 2009
Dimensions:3008x2000px (6.02 megapixels)
Date/Time of Photo:14th May 2009 14:42:55
Camera:NIKON D70
Software:Adobe Photoshop 7.0
Exposure time:1/15s
Focal Length:60mm
Focal Length (35mm film equivalent):90mm
ISO speed:250
View Brian Kosnar's Photos View Ametrine Gallery
Mineral and/or Locality  
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 1993-2017, except where stated. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: October 22, 2017 02:01:54