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Help identifying mineral like brookite.
  
  Index -> What is it? - Where is it from?
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Ricardo Melendez




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PostPosted: Aug 27, 2018 17:08    Post subject: Help identifying mineral like brookite.  

Hi, can you help me please to get a clue what mineral it could be.

It is associated with smoky quartz, orthoclase and stellerite.

it looks very similar to brookite and topaz but really I have no idea of what it really is.

Hardness : slightly scratches the glass and easily scratched by quartz.

Fracture : Irregular

thanks in advance.

Ricardo.



IMG_1804.JPG
 Mineral: unknown
 Description:
 Viewed:  1044 Time(s)

IMG_1804.JPG



IMG_1807.JPG
 Mineral: unknown
 Description:
 Viewed:  1041 Time(s)

IMG_1807.JPG



IMG_1811.JPG
 Mineral: unknown
 Description:
 Viewed:  1048 Time(s)

IMG_1811.JPG



IMG_1812.JPG
 Mineral: unknown
 Description:
 Viewed:  1055 Time(s)

IMG_1812.JPG



IMG_1817.JPG
 Mineral: unknown
 Description:
 Viewed:  1041 Time(s)

IMG_1817.JPG



IMG_1818.JPG
 Mineral: unknown
 Description:
 Viewed:  1027 Time(s)

IMG_1818.JPG


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crosstimber
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PostPosted: Aug 27, 2018 17:34    Post subject: Re: Help identifying mineral like brookite.  

Ricardo, can you tell us where this specimen is from?
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Ricardo Melendez




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PostPosted: Aug 27, 2018 17:47    Post subject: Re: Help identifying mineral like brookite.  

crosstimber wrote:
Ricardo, can you tell us where this specimen is from?



Mmmm I fill the field..., it is from Veracruz, México.
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marco campos-venuti




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PostPosted: Aug 27, 2018 19:40    Post subject: Re: Help identifying mineral like brookite.  

Titanite
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Roger Warin




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PostPosted: Aug 28, 2018 01:08    Post subject: Re: Help identifying mineral like brookite.  

Hi,
I don’t discern the crystal well but I think of a quartz crystal distorted laterally, with 2 different ternary axes. Pseudocubic habit.
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Jordi Fabre
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PostPosted: Aug 28, 2018 03:53    Post subject: Re: Help identifying mineral like brookite.  

marco campos-venuti wrote:
Titanite

I agree, it seems to be Titanite.
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Roger Warin




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PostPosted: Aug 28, 2018 06:49    Post subject: Re: Help identifying mineral like brookite.  

Hi Jordi, Marco,
I respect your experience, but I still doubt.
Ricardo said the mineral is associated with smoky quartz, orthoclase and stellerite.
The unknown crystal seems intimately fixed to smoked quartz, isn’t?
I show a pseudo-cubic quartz from Madagascar. The similarity is great with the IMG1804.



148-Amethys-Madag5256_R.jpg
 Mineral: Quartz (variety amethyst)
 Locality:
Antandrokomby pegmatite, Manandona Valley, Sahatany Valley (Mt. Ibity), Vakinankaratra Region, Antananarivo Province, Madagascar
 Description:
A pseudo-cubic habit
 Viewed:  871 Time(s)

148-Amethys-Madag5256_R.jpg


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marco campos-venuti




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PostPosted: Aug 28, 2018 07:58    Post subject: Re: Help identifying mineral like brookite.  

In the Alps there are plenty of places where titanites are very similar in color and shape to this crystal.
You can also check titanites from Imilchil, Morocco.
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Ricardo Melendez




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PostPosted: Aug 28, 2018 12:32    Post subject: Re: Help identifying mineral like brookite.  

thanks for your guide, hardness match better with Titanite, of course we need the analysis.

Will share with you more tests.
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Bob Morgan




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PostPosted: Aug 28, 2018 14:46    Post subject: Re: Help identifying mineral like brookite.  

Is the top crystal the same mineral as the one below it?

It appears to be orthorhombic - is it?

I doubt the identification with titanite. The triangular face is not one seen on titanite, and all faces are clearer of striations than I would expect.
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Roger Warin




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PostPosted: Aug 29, 2018 00:32    Post subject: Re: Help identifying mineral like brookite.  

Hi,
Quartz in pseudo-cubic habit can assume the appearance of an orthorhombic or even tetragonal prism.
However, there is Ricardo's observation:
Hardness: slightly scratches the glass and easily scratched by quartz.
Mohs hardness of glass: 5.5 and of titanite: 5.0 to 5.5.



149-Ameth-Madag5255_R.jpg
 Mineral: Quartz (variety amethyst)
 Locality:
Antandrokomby pegmatite, Manandona Valley, Sahatany Valley (Mt. Ibity), Vakinankaratra Region, Antananarivo Province, Madagascar
 Description:
 Viewed:  746 Time(s)

149-Ameth-Madag5255_R.jpg



150-Amethys-Madag5253_R.jpg
 Mineral: Quartz (variety amethyst)
 Locality:
Antandrokomby pegmatite, Manandona Valley, Sahatany Valley (Mt. Ibity), Vakinankaratra Region, Antananarivo Province, Madagascar
 Description:
 Viewed:  740 Time(s)

150-Amethys-Madag5253_R.jpg


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