1/3
?

Rutile : TiO2

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 © SMS 2006
 
 
 
 
 
minID: H3P-VJG

Rutile : TiO2

Copyright © SMS 2006  - This image is copyrighted. Unauthorized reproduction prohibited.

A silvery-black blade of rutile from Mont Saint-Hilaire. Photo is 2.5 mm in length. Associated minerals include pyrite, albite and elpidite. Specimen and photo: Steve Stuart.

Update- April 3, 2011: The following message thread relates to the ID as brookite versus rutile.

http://www.mindat.org/mesg-106-218829.html

Changed ID to rutile- April 19, 2011. See thread link above.

This photo has been shown 961 times
Photo added:27th Feb 2006
Dimensions:800x600px (0.48 megapixels)

Data Identifiers

Mindat Photo ID:50988 📋 (quote this with any query about this photo)
Long-form Identifier:mindat:1:4:50988:1 📋
GUID:896070fe-a1c6-4f82-9d52-bf5f40794ef5 📋
Specimen MinIDH3P-VJG (note: this is not unique to this photo, it is unique to the specimen)

Other Views - click to switch

Discuss this Photo

PhotosBrookite - Poudrette quarry, Mont Saint-Hilaire, Rouville RCM, Montérégie, Québec, Canada

30th Mar 2011 22:42 UTCTim Jokela Jr

Sure it's not rutile?

31st Mar 2011 06:36 UTCDomenico Preite Expert

Sure to have insert a photo?

Ciao

31st Mar 2011 14:04 UTCModris Baum 🌟 Expert

Click on the topic (at the top of the page for this thread)

2nd Apr 2011 03:57 UTCModris Baum 🌟 Expert

Since no one has picked up on this thread let me be the first to muddy the waters.


To make it easier on anyone who follows, here is the photo (by Steve Stuart) that Tim is questioning:





When I first started collecting MSH I was sure that stuff like this was brookite. However, a number of experienced MSH collectors have told me that the stuff I found is actually rutile (specifically "ilmenorutile" ) Also, all of the stuff that I have found that looks like this is from altered pegmatites and according to Horvath's MSH rarity tables (Lapis & Rivista July/August 2000) brookite is not found in this environment.


In fact, all of the reliably identified brookite from MSH that I have seen is either blocky or bi-pyramidal (pseudo hex) - somewhat like the brookite from Arkansas only much smaller. There is a more "normal" looking brookite illustrated on p. 300 of Horvath's earlier (1990) article on MSH in Min Rec but I wonder if this too isn't really rutile.


Perhaps Laszlo will step in and un-muddy the waters for us.


PS I'm not sure how my text got incorporated in the "frame" for Steve's photo and became yet another clickable link to it. But I'm too tired to figure it out at the moment.

2nd Apr 2011 04:44 UTCModris Baum 🌟 Expert

For an example of pseudo hex brookite from MSH see Monteregian Treasures (Mandarion & Anderson) Fig 15.

The tiny xls in hex brookite are similar. (These are actually from a pegmatite so I guess they violate the "not found in pegmatites at MSH rule". Never say never!)

But see also Fig 16 which is neither hex nor blocky.

2nd Apr 2011 23:16 UTCSteve Stuart Expert

00670320014977357826521.jpg
Here are some photos of the specimen. I purchased it in late 2005 as a fluorescent specimen on the Internet from NicPic (in Montreal, I think). Looks like broccoli!. Closer examination of the florets under the microscope revealed albite, pyrite and what I visually IDed as brookite based on its habit and striations.



09444420016037563941654.jpg



Any other comments, opinions?


Steve Stuart

3rd Apr 2011 00:17 UTCModris Baum 🌟 Expert

Hi Steve,


That is one weird specimen - worthy of a post in its own right!


But assuming that it's from MSH (and I think it is) it would appear to be from a pegmatite which reduces the likelihood of brookite - at least if you go by Horvath's rarity tables. (It's always possible he just forgot to make an entry.)


The only other thing I can point to are the drawings by Fisher and Glenn. Of the three brookite samples, #1 shows blocky xls (with striations on some faces), #2 is the same strange thing shown in Mandarino's Fig 15 and #3 seems like a fairly "normal" striated brookite blade. But among the rutile drawings #3 and #5 look a lot like what I expect from brookite rather than rutile - except that there seem to be few if any striations. However, some of the "ilmenorutile" that I found does have striations so I don't know if that is diagnostic. (Perhaps the experts who told me that it is ilmenorutile are wrong.)


Modris

3rd Apr 2011 00:29 UTCSteve Stuart Expert

The "broccoli" stems are elpidite. The entire specimen is about 7.5 cm (3 inches) in its longest dimension.

3rd Apr 2011 00:38 UTCModris Baum 🌟 Expert

I suspected elpidite but wasn't quite sure. So it's MSH and from a pegmatite for sure.


It's a really neat specimen - regardless of the brookite/rutile!

3rd Apr 2011 04:01 UTCSteve Stuart Expert

I have a copy of "Geology and Mineralogy of Mount St. Hilaire, Quebec", published in 1973 by the Worcester Mineral Club. On page 16, Oxides, Brookite is a sketch that is almost an exact match of the crystal form seen in my photo. I also transcribed into an Excel spreadsheet years ago the 2000 version of the rarity table for MSH minerals that was published in Lapis. I auto-filtered the column headings and subtotaled the rarity scores (1-10). When filtered for albite, elpidite, pyrite and brookite, the most likely environment that contains all four minerals is igneous breccia (15), followed by miarolitic cavities (17) and hornfels (19). None of the pegmatite environments show brookite.


When filtered for rutile instead of brookite, the most likely environments for all four minerals are altered pegmatite (15), hornfels (15), igneous breccia (17), and pegmatite-hornfels contact (18).


So, I'd like to better understand why it is certain that my specimen comes from a peg environment rather than an igneous breccia. Is it the size of the crystals? The rarity tables indicate that either one is possible, with hornfels as another possibility.


So far, there is no compelling reason for me to change the ID from brookite to rutile. But, I am open to further knowledge and discussion.


Thanks,


Steve

3rd Apr 2011 04:25 UTCModris Baum 🌟 Expert

Hi Steve,


Yes - I'd be very surprised if something as large as your specimen came from breccia and it just doesn't look like breccia material to me. But that doesn't mean too much. I certainly haven't "seen it all"!


And I'm not saying that your specimen has to be rutile. I have trouble myself believing that at least some of those "ilmenorutiles" aren't brookites. Those pseudo-hex "arkansites" I found are definetely from a pegmatite so Laszlos table may just need updating. (I'm amazed that he can keep track of all that information to begin with - easy enough to leave something out or have it get lost by the printer.)


Perhaps Tim can provide more info regarding what made him question the ID.


Modris

3rd Apr 2011 04:55 UTCSteve Stuart Expert

Thanks for your responses, Modris. Perhaps Tim J or Lazslo will wade in with more insights. Are you going to Rochester this year? I'll be in the Micromounters Playhouse.

3rd Apr 2011 13:42 UTCModris Baum 🌟 Expert

Hi Steve,


Unfortunately I no longer "travel well" so I doubt if I will be going to Rochester.


But if you show your specimen to to Quintin and the others I'm sure that you will get some reliable info. Let us know what you find out. This rutile/brookite issue at MSH has been bothering me for years.


Modris

3rd Apr 2011 16:35 UTCSteve Stuart Expert

I have added a child photo of the larger specimen to the brookite page, along with a link to this thread. I'll show it to the experts in Rochester to get some other input on the ID as brookite or rutile.

20th Apr 2011 00:14 UTCSteve Stuart Expert

Showed my specimen to Tony Steede at Rochester. He examined it under the microscope said that it was rutile, not brookite. That jives with the pegmatitic origins and has swayed me to change my ID from brookite to rutile.


Thanks for the debate and input!


Steve

20th Apr 2011 01:59 UTCModris Baum 🌟 Expert

Hi Steve,


Thanks for the update. Looks like my "informants" knew their stuff. And it's nice to know that the "no brookite in MSH pegmatites" rule is still useful (modulo those tiny "arkansite"s that I found). It's also a relief that I won't have to go re-caption all my MSH rutile photos ;)


Modris
 
Mineral and/or Locality  
Mindat Discussions Facebook Logo Instagram Logo Discord Logo
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 1993-2024, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: April 26, 2024 16:13:54