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Help with mineral found, San Rocendo Canyon, Mexico
  
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yazzyenna




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PostPosted: Jan 19, 2018 23:17    Post subject: Help with mineral found, San Rocendo Canyon, Mexico  

On a recent trip down the Rio Grande in Southern Texas/Mexico I came across a fairly wide crack in the canyon wall with some very obvious crystals. I am sure it is not anything particularly difficult to identify but I have no knowledge on the subject. I have tried to find information on the geology of the particular canyon and haven't come up with much and am just wondering if anyone out there has any insight as to what it is and how it came to be. This is the widest section I found but there were several other streaks in the rocks sometimes extending 30+feet overhead. Lots of broken pieces showing what looked like a slightly different form of mineral as well, but once again, no knowledge here. Thank you!


IMG_1072.jpg
 Dimensions: crack app. 3.5-5 cm at widest, crystals up to 1.5 cm
 Description:
 Viewed:  506 Time(s)

IMG_1072.jpg



IMG_1073.jpg
 Locality:
Coahuila (Coahuila de Zaragoza), Mexico
 Description:
 Viewed:  507 Time(s)

IMG_1073.jpg



mineral.jpg
 Description:
The bottom where the crystal is attached is very crumbly rock, pieces broke off just in touching the crystals.
 Viewed:  503 Time(s)

mineral.jpg



mineral 2.jpg
 Description:
This is the second piece I found, no where near the first large crack. There were lots of strips of this going up the sides of the canyon.
 Viewed:  504 Time(s)

mineral 2.jpg


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Peter Megaw
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PostPosted: Jan 19, 2018 23:26    Post subject: Re: Help with mineral found, San Rocendo Canyon, Mexico  

These are calcite veins and are quite common in that country. There are some veins in Big Bend National Park over 3m wide that can be traced over a km. Some of these calcites are quite fluorescent and phosphorescent.

You can prove to yourself it is calcite...by scratching with a knife or pin or putting a few drops of vinegar on it...it will fizz

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yazzyenna




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PostPosted: Jan 20, 2018 14:32    Post subject: Re: Help with mineral found, San Rocendo Canyon, Mexico  

Thank you Peter! That's the stepping stone I needed to do some further research. I hope to get back there and find these veins you speak of!
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