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Could it be a fulgurite?
  
  Index -> FOR BEGINNERS: What is it? Where is it from?
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Ricardo Melendez




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PostPosted: Sep 28, 2022 19:18    Post subject: Could it be a fulgurite?  

Hi, some weeks ago we dig in a place where a lot of lightnings strike every year, thinking about some fulgurites could be formed in place.

found this rock, formed by coarsed grain sand, some look like quartz under the magnifier.

very similar as beach sand looks like.

the rock is solid and preserves it shape but some grains can fall easily when scratched with the nails, most not.

It could be a fulgurite?



IMG_3627.JPG
 Mineral: Unknown
 Locality:
Guanajuato, Mexico
 Description:
 Viewed:  662 Time(s)

IMG_3627.JPG



IMG_3626.JPG
 Mineral: Unknown
 Locality:
Guanajuato, Mexico
 Description:
 Viewed:  661 Time(s)

IMG_3626.JPG



IMG_3630.JPG
 Mineral: Unknown
 Locality:
Guanajuato, Mexico
 Description:
 Viewed:  663 Time(s)

IMG_3630.JPG



IMG_3632.JPG
 Mineral: Unknown
 Locality:
Guanajuato, Mexico
 Description:
 Viewed:  664 Time(s)

IMG_3632.JPG



IMG_20220928_185932.jpg
 Mineral: Unknown
 Locality:
Guanajuato, Mexico
 Description:
 Viewed:  662 Time(s)

IMG_20220928_185932.jpg



IMG_20220927_203024.jpg
 Mineral: Unknown
 Locality:
Guanajuato, Mexico
 Description:
 Viewed:  663 Time(s)

IMG_20220927_203024.jpg


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James Catmur
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PostPosted: Sep 29, 2022 08:24    Post subject: Re: Could it be a fulgurite?  

To me it just looks like quartz grains centred together by some other mineral. Where did you find it in Guanajuato state?
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Pete Richards
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PostPosted: Sep 29, 2022 10:21    Post subject: Re: Could it be a fulgurite?  

If it's a fulgarite, you might expect some melted and fused grains of sand around a hollow center.
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Collecting and studying crystals with interesting habits, twinning, and epitaxy
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John S. White
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PostPosted: Sep 29, 2022 11:04    Post subject: Re: Could it be a fulgurite?  

I believe it could be a fulgurite. With this type of fulgurite the glass would be in the center, surrounded by grains of sand. However, if the center is solid glass the object should be relatively heavy. The shape is hard to equate with a fulgurite though.
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