[Rockhounds] Help with identification

[Jeffrey T. Cessna]

Pete,

I was assuming the "yellow" was the aegirine and the "dark red" was 
the pseudobrookite, as labelled by the collector/photographer. Which 
brings up the other caveat - there is no info given on how the 
identification was made. Perhaps Doug Merson is lurking out there? 
However, if it is correct there are a few other pictures without the aegirine.

Summit Rock, Klamath Co., Oregon, USA
http://www.mindat.org/photo-3458.html
http://www.mindat.org/photo-135398.html
http://www.mindat.org/photo-135399.html
http://www.mindat.org/photo-135409.html

Also, so others don't have to look it up, the black version...
Thomas Range, Juab Co., Utah, USA
http://www.mindat.org/photo-62815.html
http://www.mindat.org/photo-129380.html (look close at the edges?)

Also, with no info on how identification was made, a few other dark 
red/orange examples from other localities...
http://www.mindat.org/photo-109816.html
http://www.mindat.org/photo-109813.html
http://www.mindat.org/photo-133874.html

The pseudobrookite main page allows for dark red under the colors possible...
http://www.mindat.org/min-3302.html

Finally, my favorite photo of the lot comes from Germany, where I've 
noticed some of the women like to dye their hair bright colors ...
http://www.mindat.org/photo-132971.html

Good luck with the ID.

-Jeff



At 10:51 AM 12/11/2007, you wrote:
>Yes, but isn't the brown stuff the aegirine and the pseudobrookite
>still black (just one crystal)?
>
>Pete
>
>
>On Dec 11, 2007, at 10:38 AM, Jeffrey T. Cessna wrote:
>
>>All of the Thomas Range, Utah pictures on Mindat.org are black, but
>>here is a picture from Summit Rock, Klamath Co., Oregon...
>>
>>http://www.mindat.org/photo-135505.html
>>
>>-Jeff
>>
>>
>>At 08:16 AM 12/11/2007, you wrote:
>>>Hi all,
>>>
>>>I have several samples of a long prismatic orange-brown mineral
>>>identified as pseudobrookite, associated with light-colored amethyst
>>>and said to be from the Thomas Range in Utah.  I am skeptical about
>>>the identification as pseudobrookite, since all of the pseudobrookite
>>>I have seen is nearly black.  Can any of you Westerners confirm or
>>>refute this identification, and if you recognize the material can you
>>>give me a more detailed location?
>>>
>>>Two digital images can be viewed at www.geocities.com/sajas.geo/ 
>>>oh/ oh.html.  You'll probably have to copy the URL and paste it
>>>into your
>>>web browser.  Ignore the title at the top of the page.  I know that
>>>the Thomas Range is not in Ohio....
>>>
>>>Thanks!
>>>Pete Richards
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>>
>>
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>
>___________________________________
>R. Peter Richards
>rpr at heidelberg.edu
>Morphological crystallographer
>
>
>
>
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