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Second picture of the green crystal material. Please help identify. Thanks

0 votes

asked Oct 17, 2018 by Timothybradley (140 points)

4 Answers

0 votes
You can help us, in fact you have to, by seeing if you can scratch the surface of the green material. See if you can scratch it with a common nail, a pocketknife or nail file. You can do the same to the white crystals. Let us know.
answered Oct 17, 2018 by Weasel (58,240 points)
I used a very fine pointed 1 in nail and it will not scratch or dig into any of the crystals. The nail just slides across the surfaces. So I guess it’s pretty hard material. In case your interested this was buried in yard about two feet down near my garage here in Loogootee, Indiana. I’m sure it was buried by someone at least 75 years ago. That’s when the garage was added to the 1890s house I live in. The large crystal cluster is 3 inches long. The whole stone is around 12x12 inchees. The top surface is like a crust of white, yellowish and green crystals. There are a few scattered brown or deep red crystals that I can’t scratch either. I’m really curious what this is. Thanks in advance.
0 votes
How hard is the rock around it? Does it feel more like sediment or basalt?
answered Oct 18, 2018 by linkisnotzelda (5,360 points)
I’m not a geo type person. The rock looks like is it sedimentary. But it is a pretty hard stone. I can’t scrape the stone very easily. The crystal crust on top flakes of the main stone easily.
Any ideas so far on what I found? I’m close to Indiana University, and am thinking of taking it up to the Geology Department.  Would it be worth me doing that?
I would take it in if you can easily do so. They likely could offer more help in identification.
0 votes
I am thinking along the lines of olivine, epidote or emerald. Obviously, it is encased in another rock with different crystals. Taking the rock to the university is one way. If they can't help, a lapidary at a rock store or even a jeweler might. Olivine is probably your best bet.
answered Oct 18, 2018 by Weasel (58,240 points)
I haven’t heard from anyone here for awhile. I reached out Indiana University Geology Department chair, Professor Brophy. I’m hoping to hear from him. I would love to hear from more folks on here about my strange crystal stone. Thanks!
Do all the crystals look the same structure wise? Or are there different forms? (prism, cubic, massive, etc.)
0 votes
TImothy, a good suggestion based on color, locality, and (hard to see) crystal faces, would most likely indicate fluorite. May I request you post a few more pictures, and perhaps a close-up if possible?


answered Jun 6, 2019 by hershel (52,580 points)