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Identity HelpPlease help identify

22nd Oct 2019 21:13 UTCSteffen Baumgart

Please help identify this found outside of Hidalgo, Mexico

22nd Oct 2019 21:15 UTCSteffen Baumgart


Steffen Baumgart  ✉️


22nd Oct 2019 21:17 UTCSteffen Baumgart

More photos

22nd Oct 2019 21:31 UTCJosé Zendrera Expert

Hardness? Can you scratch a bottle glass with it? Can you scratch it with a knife? Can you scratch it with a fingernail? in the latter case could be gypsum.

23rd Oct 2019 03:31 UTCSteffen Baumgart

Thanks you for your response. You cannot scratch a bottle with it. You can scratch it with your fingernail or a knife. I'm going to try and attach a video. There's a silvers sparkle to it that the photos don't pick up.

23rd Oct 2019 03:37 UTCSteffen Baumgart


23rd Oct 2019 12:31 UTCEd Clopton Expert

It's always hard to say for sure from a photo, but it looks like calcite or gypsum.  If you crush a bit of the clear mineral to powder and add vinegar, does it bubble?  That would indicate a carbonate mineral, probably calcite.  If not, then gypsum is a likely possibility.

What is the geology of the area where it was found--sedimentary?  volcanic?  The sparkles demonstrated in your video and the large clear mass may be two different minerals.  Often several different minerals are present in a rock, and it can be difficult to sort them out, especially from a photo.

25th Oct 2019 00:49 UTCSteffen Baumgart

Thanks for the response! No bubbles with vinegar.

23rd Oct 2019 15:47 UTCPeter Slootweg

Looks like Gypsum to me. 

25th Oct 2019 00:49 UTCSteffen Baumgart


24th Oct 2019 02:50 UTCPaul Brandes Manager

Welcome to Mindat, Steffen!

If you can scratch this with your fingernail, as you indicated in a previous post, then you likely have gypsum.

25th Oct 2019 00:50 UTCSteffen Baumgart

Thank you! 
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