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Mineral identification
  
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ricknsarah




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PostPosted: Aug 21, 2018 10:49    Post subject: Mineral identification  

I am wondering if anyone knows what mineral this is. I don't have locality information. It's about 1.5 inches square. It is orangish red. I could probably come up with a little more information later if necessary - I'm just hoping it will be very obvious to someone.


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ricknsarah




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PostPosted: Aug 21, 2018 10:50    Post subject: Re: Mineral identification  

Here is another picture.


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Kevin Schofield




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PostPosted: Aug 21, 2018 11:20    Post subject: Re: Mineral identification  

ricknsarah wrote:
Here is another picture.


Looks like a rather dull-coloured specimen of crocoite from the geometry of the crystals. From the matrix I would guess an old specimen more likely of German or Russian provenance than from the more recent much more colourful mining in Tasmania. I suggest you check out the Crocoite Mindat page.

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Jordi Fabre
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PostPosted: Aug 21, 2018 11:28    Post subject: Re: Mineral identification  

It looks to me like a Quartz with inclusions of iron oxides. Please try if some of the elongated crystals scratches a glass...
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Matt_Zukowski
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PostPosted: Aug 21, 2018 11:44    Post subject: Re: Mineral identification  

What is the shape of the xtals if you look down their long axes? A square, a hexagon, a rectangle?
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ricknsarah




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PostPosted: Aug 21, 2018 11:48    Post subject: Re: Mineral identification  

Looks right to me - thanks a lot!


Kevin Schofield wrote:
ricknsarah wrote:
Here is another picture.


Looks like a rather dull-coloured specimen of crocoite from the geometry of the crystals. From the matrix I would guess an old specimen more likely of German or Russian provenance than from the more recent much more colourful mining in Tasmania. I suggest you check out the Crocoite Mindat page.
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Tobi




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PostPosted: Aug 22, 2018 01:01    Post subject: Re: Mineral identification  

I agree with Kevin, it looks like crocoite ...
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Jordi Fabre
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PostPosted: Aug 22, 2018 05:59    Post subject: Re: Mineral identification  

Is not Crocoite at all. The color of the photos confuses....
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Kevin Schofield




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PostPosted: Aug 22, 2018 07:03    Post subject: Re: Mineral identification  

Jordi Fabre wrote:
Is not Crocoite at all. The color of the photos confuses....


I guess we need the answer to Matt's question. On blowing up the pictures, I do think I see a hexagonal prism cross-section down in the bottom right of the second photo (supporting the Jordi hypothesis), but on the other hand there also seem to be a lot of orthogonal faces and I can see no prism terminations, which was why I went for crocoite.

As ever with photo IDs, we need to poster to do a little work on their own behalf!

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vic rzonca




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PostPosted: Aug 22, 2018 07:44    Post subject: Re: Mineral identification  

Identifying minerals from images, entails a bit of this. ( Please delete if inappropriate.)


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lluis




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PostPosted: Aug 22, 2018 08:15    Post subject: Re: Mineral identification  

Dear all

I rely in Jordi. I know him personally.
But in this case, as Kevin and Tobias said, it looks to me more to anything like crocoite than to quartz...
As Kevin said, I could not see hexagonal prisms... and I think to see orthogonal faces...
Besides, I do not think it is Russian crocoite.. The ones I have seen look very different....

And besides of that, photo is clumsy... if poster could be so kind to tell us how colors look like, or posts a better photo, then we would not need to do as Vic says.....
As warlock I am not exactly great.... :-(

Or, if possible, do a density test in a fragment of the red/reddish/who knows parts....
Then easy to say if quartz or crocoite....

With best wishes

Lluís
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crosstimber
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PostPosted: Aug 22, 2018 08:46    Post subject: Re: Mineral identification  

A simple hardness test will distinguish crocoite from quartz.
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Jordi Fabre
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PostPosted: Aug 22, 2018 08:48    Post subject: Re: Mineral identification  

Jordi Fabre wrote:
Please try if some of the elongated crystals scratches a glass...

Maybe you can't see the prism terminations because most of them could be broken...
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Peter Lemkin




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PostPosted: Aug 22, 2018 08:55    Post subject: Re: Mineral identification  

Another, clearer photo with a color chart next to it would be nice, but a simple scratch test and hardness test will tell a lot also....... All too many newbees think that those very familiar with minerals can tell what a specimen is from a photo. Sometimes, yes; often times, no..... tests are necessary or at least looking at it from many angles; knowing more about where it came from; associated minerals and on and on and on....I have some minerals I have spent days, weeks or months trying to formally identify even after looking at it under a microscope - so just 'seeing' is not definitive by any means, with some notable exceptions. The 'What is it' for beginners I believe asks them to do some simple tests - but few do....
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Mathias




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PostPosted: Aug 22, 2018 11:17    Post subject: Re: Mineral identification  

The color resembles red Heulandite.
Mathias
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Peter Slootweg




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PostPosted: Aug 23, 2018 02:08    Post subject: Re: Mineral identification  

Kevin got it right i believe. 3 reasons for crocoite. 1. Crystals have a sqare cross section. 2. Crystals show striations parallel to the length (rules out quartz). 3. Occurrence on gossan matrix with gibbsite clay is typical for many crocoite specimens.
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