1/1
?

Corundum (Var: Ruby) : Al2O3, Phlogopite : KMg3(AlSi3O10)(OH)2

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

Scalebar

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 in default position, double click will make it circular.

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 © 2001 John H. Betts
 
 
 
 
minID: QWM-U8A

Corundum (Var: Ruby) : Al2O3, Phlogopite : KMg3(AlSi3O10)(OH)2

Copyright © 2001 John H. Betts  - This image is copyrighted. Unauthorized reproduction prohibited.
Dimensions: 33 mm x 32 mm x 16 mm

Single crystal of bright red, pseudo-octahedral ruby on white marble matrix with minor phlogopite. Fluoresces red under UV illumination. Overall size of mineral specimen: 33x32x16 mm. Size of individual crystals: 13 mm.

This photo has been shown 4313 times
Dimensions:379x378px (0.14 megapixels)

Data Identifiers

Mindat Photo ID:2070 📋 (quote this with any query about this photo)
Long-form Identifier:mindat:1:4:2070:8 📋
GUID:c52c8622-ba3e-4c8d-86fe-5a7856b14e27 📋
Specimen MinIDQWM-U8A (note: this is not unique to this photo, it is unique to the specimen)

Discuss this Photo

PhotosSpinel - Jegdalek ruby deposit, Surobi District, Kabol Province, Afghanistan

15th Apr 2018 12:29 UTCNick Gilly

Is this not actually corundum var. Ruby? The striations on the crystal faces look typical of corundum to me. I know it can form 'pseudo-octahedral' crystals on occasion.

15th Apr 2018 15:29 UTCAndrew Debnam 🌟

Hello Nick, Spinel does occur in white marble deposits in Afghanistan as well. The Ruby in Jegdalek occurs most commonly as hexagonal prisms. This to my mind anyway is a somewhat controversial deposit. Gemologists might tell you much of material marketed as Ruby from here is actually pink sapphire because it does not make the cut in attributes to considered Ruby. You may find this article of interest


www.ruby-sapphire.com/afghanistan-ruby-spinel.htm



I would be interested in others views on this as well

15th Apr 2018 15:31 UTCKevin Conroy Manager

I think a hardness test would give a definitive answer.

15th Apr 2018 17:04 UTCUwe Kolitsch Manager

From the same locality: a "spinel" with twin lamellae strongly indicating ruby:

https://www.mindat.org/photo-4724.html


Message sent.

15th Apr 2018 17:07 UTCUwe Kolitsch Manager

Weirdly, the caption of the first photo reads

"Single crystal of bright red spinel (variety Ruby) ...".

15th Apr 2018 17:10 UTCNick Gilly

Thanks for the article Kevin. I have a couple of specimens of ruby from Jegdalek myself, one of which is a roughly-formed trigonal prism, quite gemmy, and of a pinkish-red colour in the typical light greyish marble matrix, accompanied by a tiny pyrite crystal. The subject of the photo is borderline in colour for ruby/pink sapphire IMHO. It's the trigon growth feature and twin lamellae on the crystal face that makes me think it's a corundum, not a spinel.




Uwe, yes I saw that pic too. Not only does it appear to have twin lamellae, but the shape looks 'off' for an octahedron.




Ironically John Betts' website also has a nice pic of a ruby crystal illustrating exactly what I mean:




http://www.johnbetts-fineminerals.com/jhbnyc/mineralmuseum/60569.jpg

17th Apr 2018 14:49 UTCUwe Kolitsch Manager

Fixed.

17th Apr 2018 14:51 UTCUwe Kolitsch Manager

Message also sent on https://www.mindat.org/photo-489101.html

18th Apr 2018 08:25 UTCNick Gilly

Thanks Uwe.

18th Apr 2018 10:34 UTCUwe Kolitsch Manager

489101 fixed.
 
矿物 and/or 产地  
Mindat Discussions Facebook Logo Instagram Logo Discord Logo
版权所有© mindat.org1993年至2024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 - Report a bug/vulnerability Current server date and time: 2024.4.26 11:47:48