Heulandite-Ca : (Ca,Na)5(Si27Al9)O72·26H2O, Stilbite-Ca : NaCa4[Al9Si27O72]·nH2O, Epidote : {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)

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: 44J-6V4

Heulandite-Ca : (Ca,Na)5(Si27Al9)O72·26H2O, Stilbite-Ca : NaCa4[Al9Si27O72]·nH2O, Epidote : {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)

This image has been released to the public domain and may be used freely.
Field of View: 4.4 mm

The heulandite spans > 4mm. Via Nick Zipco (1994).

When looking at this photo, bear in mind that it is from Sterling Hill – not some trap rock quarry! Per Steve Kuitems, this is likely from the 900’ level zeolite occurrence.

This was originally posted as apophyllite but Steve noticed that it is probably heulandite. I have now replaced the parent photo with one that shows this more clearly. (The heulandite is water clear but looks green due to underlying epidote.)

The heulandite is associated with abundant well formed stilbite (left), granular epidote (pistachio green) and actinolite (pine green acicular xls).

Note also that these xls are part of a rather large (12 x 7½ x 4½) stilbite/epidote specimen (see http://www.mindat.org/photo-201839.html and http://www.mindat.org/photo-501254.html ) which is impossible to orient under a scope to get proper lighting of the xls. Stereo (see the child photo) does help to clarify the morphology and relationships. Unfortunately I was not able to get a stereo version of the new parent photo (the specimen is too unstable in this position) but the original works well enough in stereo.

This photo has been shown 438 times
Photo added:29th Apr 2012
Dimensions:673x1024px (0.69 megapixels)
Date/Time of Photo:29th Apr 2012 13:42:01
Camera:CANON EOS 400D / Digital Rebel XTi / Kiss Digital X
Software:Adobe Photoshop CS3 Windows
Exposure time:1/8s
ISO speed:100

Other Views - click to switch

Mineral and/or Locality  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Public Relations by Blytheweigh.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2019, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: October 20, 2019 00:20:36