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Bluish crystal ID
  
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Robson Vieira




Joined: 05 Jan 2017
Posts: 10
Location: São Paulo

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PostPosted: Jan 11, 2017 16:28    Post subject: Bluish crystal ID  

Hello there! I would like to ask your help to identify a mineral on matrix. The mineral is too small, so I could not measure and test its properties. If the images allow, please tell me about it. It was found at an Ignimbrite quarry, and the minerals associated are laser Quartz, Goethite, Epidote and Pyrite. The crystals I want to identify are bluish to in color. To me, they look like Analcime, due to the crystal habit, but the bluish color I doubt, because I have never seen blue analcime, perhaps I'm mistaken.


SAM_2922.JPG
 Mineral: Unknown
 Locality:
Campos Gerais do Paraná, Paraná, Brazil
 Dimensions: 1,0 x 1,0 mm
 Description:
 Viewed:  827 Time(s)

SAM_2922.JPG



SAM_2923.JPG
 Mineral: Unknown
 Locality:
Campos Gerais do Paraná, Paraná, Brazil
 Dimensions: 1,0 x 1,0 mm
 Description:
 Viewed:  818 Time(s)

SAM_2923.JPG



SAM_2926.JPG
 Mineral: Unknown
 Locality:
Campos Gerais do Paraná, Paraná, Brazil
 Dimensions: 1,0 x 1,0 mm
 Description:
 Viewed:  824 Time(s)

SAM_2926.JPG



SAM_2928.JPG
 Mineral: Unknown
 Locality:
Campos Gerais do Paraná, Paraná, Brazil
 Dimensions: 1,0 x 1,0 mm
 Description:
 Viewed:  820 Time(s)

SAM_2928.JPG



SAM_2929.JPG
 Mineral: Unknown
 Locality:
Campos Gerais do Paraná, Paraná, Brazil
 Dimensions: 1,0 x 1,0 mm
 Description:
Microphoto attempt...
 Viewed:  823 Time(s)

SAM_2929.JPG


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Bob Carnein




Joined: 22 Aug 2013
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PostPosted: Jan 11, 2017 17:29    Post subject: Re: Bluish crystal ID  

The matrix doesn't look like any ignimbrites I have seen; do you know why they were quarrying ignimbrite? (Sometimes, the first step in IDing any mineral is to establish the identity of the host rock.)
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Robson Vieira




Joined: 05 Jan 2017
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PostPosted: Jan 11, 2017 18:55    Post subject: Re: Bluish crystal ID  

Hi Bob,
Thank you for responding. There is a goethite and quartz layer under the unknown mineral. I realize the Ignimbrite matrix does not appear in the picture, but surely I'm going to confirm whether it is Ignimbrite or not. The quarry was extracting materials for building and road construction. ...
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Bob Carnein




Joined: 22 Aug 2013
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PostPosted: Jan 11, 2017 21:29    Post subject: Re: Bluish crystal ID  

My "first guess" would be calcite. I would use a needle to check hardness (less than steel) and pick off a single crystal, crush it on a piece of glass or pottery, and then drop some vinegar on it. There should be a very slow emission of bubbles if it is calcite.
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Riccardo Modanesi




Joined: 07 Nov 2011
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Location: Milano

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PostPosted: Jan 12, 2017 02:49    Post subject: Re: Bluish crystal ID  

Hi to everybody!
For what I saw in the first photo: what's more interesting are those small purplish crystals in the low sector of the rock. A sightseeing at the microscope should clear something more about.
Greetings from Italy by Riccardo.

_________________
Hi! I'm a collector of minerals since 1973 and a gemmologist. On Summer I always visit mines and quarries all over Europe looking for minerals! Ok, there is time to tell you much much more! Greetings from Italy by Riccardo.
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Robson Vieira




Joined: 05 Jan 2017
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Location: São Paulo

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PostPosted: Jan 12, 2017 07:22    Post subject: Re: Bluish crystal ID  

Hi to all. Thanks Bob and Ricardo. I'm adding more pics to help a little bit. I tested the hardness (can you imagine the difficulty to do that with such a little thing?) which is about 3.5 to 4.0 because it scratches calcite quite easily, but it does not scratch a Fluorite crystal. The mineral does not fizz in vinegar. Could it be Fluorite? On another hand, under the microscope I was unable to see the characteristic cleavage of Fluorite. Have fun.


SAM_2931.JPG
 Mineral: Unknown
 Locality:
Campos Gerais do Paraná, Paraná, Brazil
 Dimensions: 1,0 x 1,0 mm
 Description:
Scratch on Calcite
 Viewed:  619 Time(s)

SAM_2931.JPG



SAM_2933.JPG
 Mineral: Unknown
 Locality:
Campos Gerais do Paraná, Paraná, Brazil
 Dimensions: 1,0 x 1,0 mm
 Description:
The tool for hardness test. Works very well.
 Viewed:  614 Time(s)

SAM_2933.JPG



SAM_2934.JPG
 Mineral: Unknown
 Locality:
Campos Gerais do Paraná, Paraná, Brazil
 Dimensions: 1,0 x 1,0 mm
 Description:
A single crystal. Not much developer though.
 Viewed:  614 Time(s)

SAM_2934.JPG



SAM_2935.JPG
 Mineral: Unknown
 Locality:
Campos Gerais do Paraná, Paraná, Brazil
 Dimensions: 1,0 x 1,0 mm
 Description:
An Ignimbrite i referred.
 Viewed:  611 Time(s)

SAM_2935.JPG


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