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Anatase : TiO2, Quartz : SiO2

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minID: E1Q-RMM

Anatase : TiO2, Quartz : SiO2

This image is copyrighted. Unauthorized reproduction prohibited.
Field of View: 15 mm

A dark brown anatase crystal attached to prism face of quartz. Specimen collected 5/30/02 by Robert E. Walstrom from material derived from the main pocket. Photo: Robert E. Walstrom.

Collected: 2002 by Robert E. Walstrom

This photo has been shown 140 times
Photo added:6th Sep 2020
Dimensions:1035x778px (0.81 megapixels)

Data Identifiers

Mindat Photo ID:1074923 📋 (quote this with any query about this photo)
Long-form Identifier:mindat:1:4:1074923:9 📋
GUID:5d777e84-5900-4051-a9e6-c5c5f8615ea7 📋
Specimen MinIDE1Q-RMM (note: this is not unique to this photo, it is unique to the specimen)

Discuss this Photo

Photosanatase

6th Sep 2020 18:17 UTCJennifer Cindrich

Can someone please tell me if I’m wrong. But I don’t see any anatase in this photo.

Jennifer

6th Sep 2020 18:58 UTCAlfredo Petrov Manager

The dark brown speck on the upper left part of the quartz crystal.

6th Sep 2020 19:43 UTCHerwig Pelckmans

Hi Jennifer,
I agree the photo is really bad, but I assume Robert could not do better. It is indeed the brown speck that is the anatase (as specified, on a prism face of the quartz crystal).

Robert Walstrom is known for his scientific approach of the hobby, and as such I trust his identifications, even when his photos are below standard. I think in this case he just wanted to illustrate the presence of the species.

Cheers, Herwig
ACAM & MKA (Belgium) 

6th Sep 2020 20:05 UTCJennifer Cindrich

Herwig,

I understand what your saying, but this could be anything. I know that even the best, most respected collectors sometimes make mistakes. I’m not saying he made one, but if it were me, I would have it tested.
I understand the eye seeing better than what the photo sometimes shows. But to put it on mindat that way,  just causes some possible newbie collectors to find a brown spec on quartz and think it’s anatase. It’s misleading to those folks. 

Jennifer

6th Sep 2020 20:15 UTCDon Saathoff Expert

Jennifer, Bob doesn't guess - he has his finds tested.  His only purpose in posting to mindat is to give an idea of what may be found at a particular location - regardless of the quality of the specimen or his photography.  I am familiar with the location and his example is reasonable for the location.  I doubt his images will ever get past the location page...where they belong.

6th Sep 2020 20:29 UTCJennifer Cindrich

Don,

Thats great that he gets his finds tested! Would love to see the test result added as a child photo for reference. It would help me to not question the photo that seems questionable.

Jennifer

6th Sep 2020 20:07 UTCThomas Lühr Expert

For such cases www.mineralienatlas.de has the option to exclude such kind of photos from the species gallery (where it really does not make any sense) but include it in the locality gallery (where it may make alot sense).

Food for thoughts to improve mindat ;)

6th Sep 2020 20:09 UTCAlfredo Petrov Manager

An excellent idea, Thomas!

6th Sep 2020 23:57 UTCThomas Lühr Expert

07921860016016556486405.png
Alfredo,
here is a screenshot, just to illustrate how it works with mineralienatlas. One can assign a number of 'properties' to a photo. If 'evidence sample for a locality' is assigned, it will not be shown in the species gallery, all other is not influenced. 
My personal guess is that many user may hesitate to upload their photos because they are concerned to 'contaminate' the gallery or are feared that their photos may end up as 'user only'.

7th Sep 2020 05:30 UTCKelly Nash 🌟 Expert

If one has approval to edit a locality, he or she can see that anatase from that locality has been confirmed by microprobe analysis (EPMA) by Robert.  There has not been a requirement in Mindat to also post a picture of the test results. It does seem too bad, however, that only those with editing approval can see that it was analytically confirmed there. Perhaps consideration should be given to adding that field to the regular "detailed mineral list", rather than having it only accessible to registered users with editing approval who have gone into the mineral list in editing mode to find it. 

7th Sep 2020 11:44 UTCDavid Von Bargen Manager

09864540016016556483256.png
Anyone can see that it has been analysed. You just have to go to the locentry page (Clicking the "i" in front of the mineral on the locality page.)

7th Sep 2020 11:58 UTCJennifer Cindrich

David,

 That’s wonderful! Thank you for pointing this feature out! That’s what mindat is for is learning.

Thank you,

Jennifer

7th Sep 2020 12:09 UTCDavid Von Bargen Manager

Although there are not many entries this is also where you can see (and enter) age information, chemical analyses and formation names.

7th Sep 2020 15:13 UTCKelly Nash 🌟 Expert

Thanks again David. I've sure been finding that information the hard way.

7th Sep 2020 15:15 UTCJennifer Cindrich

David,

Does the analysis speak for both photos or just the one? I was not aware that an inclusion in a mineral could be tested. 


Jennifer

7th Sep 2020 17:19 UTCDavid Von Bargen Manager

The analysis is for the mineral at the locality. To see which (if any) of the photos were analysed, you would have to look at the photo cation. I know that raman can be used for the identification of minerals as inclusions.

7th Sep 2020 06:55 UTCClosed Account 🌟

There are indeed "better" photos of anatase.

But I want to thank Robert for diligently recording and documenting this (and many other localities).

I am lucky enough to be able to "outsource" photos of samples that are beyond my and my machinery's capabilities. But not everybody else is. So I am happy to see Robert's photos, even if they are not POTD quality.

I tend to become grumpy if the quality of the photos of a valued member of Mindat - which Robert definitively is - is being criticized without taking available equipment and skills into account. This might have a chilling effect that we definitively do not want.

So once again: Thank you, Robert, for posting this and many other interesting photos!

Cheers,

Branko

7th Sep 2020 11:14 UTCSilvio Herrmann

Hi Branko,

better a bad picture than none at all...i agree. But in my opinion you should approximately recognize what it is.
In this case i need very much phantasy ;o) and yes...it could be anatase.

My photos are also not POTD-quality, but you can recognize the mineral (i hope so).
I don't use a high-end equipment, only my smartphone and microscope and it works well.

Only an opinion of a newbie :o)

Glück Auf from Germany
Silvio

7th Sep 2020 14:20 UTCHarold Moritz 🌟 Expert

No matter what equipment one has, there is always going to be something beyond its capabilities, so one does their best. If this were my photo I would simple add to the caption that even though it is difficult to see in the pic, it has been analyzed. If I have analyses, I add them as child photos to the mineral pic under the "other" category and write that info in the mineral's "i" page - where I would also write the habit, size range and associations. 

IMO not enough contributors fill out the details on the "i" pages. The "believed valid" status is essentially the default setting and to me means that when the locality page was created and the minerals there-at listed, someone just copied them from whatever references were used without independent verification. Often this is just a list of mineral names that, quite frankly, commonly are speculation or guesses. Yet even for many world famous locations where detailed Min Record articles have been written no one has included any of the details of occurrence into mindat.

Even low quality photos can show that, for a specific locality, yes this mineral is really there, not just posted from an unverified list.
 
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