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Identity HelpUnknown Green and White Mineral from Guatemala Highlands
1st May 2017 23:03 UTCRobert Darabos
Found in Chiantla in the highlands of Guatemala (up in the Cuchumatantes Mountains).
This was found in an old dried up river bed.
The specimen itself is various colors of Green, some sections appearing semi-transparent.
It scratches easily with steel. The material itself will also leave a scratch mark on glass. It does not appear to scratch with fingernail.
The white material is quite brittle and looks like it has dendrites on it. I thought Chacedony at first, but it scratches quite easily and is pretty brittle. It is found throughout the entire matrix of the largest piece of this I found. One of the photos shows the light easily passing through a small specimen.
Any chance it is Dendritic opal? And any way to test for Opal?
1st May 2017 23:07 UTCRobert Darabos
this shot showed some nice cleavage, thought it would help a lot with an I.D.
2nd May 2017 01:34 UTCReiner Mielke Expert
2nd May 2017 01:59 UTCRobert Darabos
Could the white be Serpentine too? Or would it be something else? Opalized Serpentine?
2nd May 2017 04:12 UTCGregg Little 🌟
2nd May 2017 12:38 UTCPaul Brandes 🌟 Manager
This specimen seems to be a mixture of at least a few different things which could potentially give different hardness results. It also seems from the photos that you're probably dealing with a couple different periods of mineral formation; the original rock, then a crust of some sort that formed over. It's going to be quite difficult to accurately determine what you have Robert without actually seeing the specimen in person.
2nd May 2017 20:20 UTCRobert Darabos
I'm coming to the states the end of this month.
I'll mail a bunch of samples I have been finding if any one if interested.
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