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bontix77




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PostPosted: Apr 17, 2019 20:11    Post subject: What is this? Another one  

Bought in real de catorce, Mexico. Small transparent crystals intergrown with yellowish opaque partially translucent cone shape crystals. Cones crystal look like be composed by layers. No lw fluorescence. I was thinking calcite but the missing fluorescence is not in agree.


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Kevin Conroy




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PostPosted: Apr 17, 2019 20:42    Post subject: Re: What is this? Another one  

Not all calcite fluoresces. The opaque crystals, as well as the clear crystals, could be calcite. If you put a few drops of vinegar on the crystals and bubbles form, it's almost certainly calcite. Be sure to wash the specimen in water after this test!
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bontix77




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PostPosted: Apr 17, 2019 21:55    Post subject: Re: What is this? Another one  

Kevin Conroy wrote:
Not all calcite fluoresces. The opaque crystals, as well as the clear crystals, could be calcite. If you put a few drops of vinegar on the crystals and bubbles form, it's almost certainly calcite. Be sure to wash the specimen in water after this test!


I did the vinegar test. I didn't saw effervescence.
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Kevin Schofield




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PostPosted: Apr 18, 2019 08:41    Post subject: Re: What is this? Another one  

bontix77 wrote:
Kevin Conroy wrote:
Not all calcite fluoresces. The opaque crystals, as well as the clear crystals, could be calcite. If you put a few drops of vinegar on the crystals and bubbles form, it's almost certainly calcite. Be sure to wash the specimen in water after this test!


I did the vinegar test. I didn't saw effervescence.


Another possibility for the pinkish crystals with the rather pearly lustre is either dolomite or a magnesian calcite. Those also may only have dull or no fluorescence, and would need a stronger acid than vinegar to produce effervescence.

The smaller colourless crystals are a little too small to get a better handle on for me...

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Kevin Conroy




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PostPosted: Apr 18, 2019 12:46    Post subject: Re: What is this? Another one  

It looks like one of the crystals is broken, and exhibits characteristics of a cleavage plane. Maybe try the vinegar test again on this surface.


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bontix77




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PostPosted: Apr 18, 2019 15:09    Post subject: Re: What is this? Another one  

Kevin Conroy wrote:
It looks like one of the crystals is broken, and exhibits characteristics of a cleavage plane. Maybe try the vinegar test again on this surface.


OK, thanks for the suggestion.
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