# Recognize this mineral? (Picture)

**URL:** <https://boards.straightdope.com/t/recognize-this-mineral-picture/717906>\
**Category:** Factual Questions\
**Created:** [April 17, 2015, 1:48pm UTC](https://boards.straightdope.com/t/recognize-this-mineral-picture/717906 "2015-04-17T13:48:24Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![cwthree](https://avatars.discourse-cdn.com/v4/letter/c/9de0a6/32.png) [@cwthree](https://boards.straightdope.com/u/cwthree)\
**Post date:** [April 17, 2015, 1:48pm UTC](https://boards.straightdope.com/t/recognize-this-mineral-picture/717906/1 "2015-04-17T13:48:24Z")

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I know it looks like something the cat brought up/excreted, but apparently it’s a chunk of rock my friend found. He’s wondering what it is, and I’m no help.

I submit his question, therefore, to the collective genius of the 'Dope. Anyone recognize it?

Thanks!

[http://i587.photobucket.com/albums/ss320/cwthree/Mobile%20Uploads/FB\_IMG\_1429278151874.jpg](http://s587.photobucket.com/user/cwthree/media/Mobile%20Uploads/FB_IMG_1429278151874.jpg.html)

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**Author:** ![cwthree](https://avatars.discourse-cdn.com/v4/letter/c/9de0a6/32.png) [@cwthree](https://boards.straightdope.com/u/cwthree)\
**Post date:** [April 17, 2015, 1:51pm UTC](https://boards.straightdope.com/t/recognize-this-mineral-picture/717906/2 "2015-04-17T13:51:32Z")

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I should add that he found this in Arizona, but he didn’t say where in Arizona.

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**Author:** ![beowulff](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/beowulff/32/542_2.png) [@beowulff](https://boards.straightdope.com/u/beowulff)\
**Post date:** [April 17, 2015, 1:52pm UTC](https://boards.straightdope.com/t/recognize-this-mineral-picture/717906/3 "2015-04-17T13:52:14Z")

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[Chalcedony](http://anymineral.com/image/cache/data/minerals/chalcedony%20228%20(4)-650x500.JPG)?

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**Author:** ![swampspruce](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/swampspruce/32/261_2.png) [@swampspruce](https://boards.straightdope.com/u/swampspruce)\
**Post date:** [April 17, 2015, 2:15pm UTC](https://boards.straightdope.com/t/recognize-this-mineral-picture/717906/4 "2015-04-17T14:15:15Z")

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I’d agree with **Beowulff** , it looks a lot like chalcedony.

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**Author:** ![cwthree](https://avatars.discourse-cdn.com/v4/letter/c/9de0a6/32.png) [@cwthree](https://boards.straightdope.com/u/cwthree)\
**Post date:** [April 17, 2015, 9:29pm UTC](https://boards.straightdope.com/t/recognize-this-mineral-picture/717906/5 "2015-04-17T21:29:04Z")

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Thanks, \*\*Beowulff \*\*and **swampspruce**!