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Clover creek Idaho mineral ID help!

Posted by Levi Forshee  
Levi Forshee August 10, 2018 03:58AM
I found some fluorescent yellow crystals, most of them heavily weathered on top of and inside this beady formation in a hole. I've never seen minerals form like this, and it's my first real find without knowing where to look, so it has me pretty intrigued. I have plenty of pictures and I'll do my best to post more or answer any questions regarding. I'm limited to 3 pics to start so these will give you a little idea of what I'm seeing. Thanks for the help!

Levi Forshee August 10, 2018 04:05AM

Longwave uv, fluorescence stays for visible with lights of for around 10 seconds.

Close up of the spiny bead covered formation I'm interested in knowing more about.

One of the larger crystal pieces, very opaque. Some of the clean breaks on some of the crystals reveal beautiful clarity, while some of the more heavily weathered crystals have what looks like cuts in them
Reiner Mielke August 10, 2018 11:31AM
What is the hardness, do they effervesce in acid, and what is the specific gravity?
Paul Brandes August 10, 2018 01:18PM
Welcome to Mindat, Levi!

Without some basic testing as Reiner suggests, it's going to be difficult to provide any kind of a guess as to what you have. Also, where did you find this; mountains, desert, etc.?
Levi Forshee August 10, 2018 10:07PM
Hey guys,
I lack some of the basic testing stuff, like acid, so it's a little tough to answer. I know I'm not giving you much to go off of. I found it in a desert area, in a hillside of basalt. The only strange thing that caught my eye from the area were the crystal lined pores in the rock. I'll attach a couple more photos.

As for the mineral itself:
It lacks any luster wet or dry, and will not absorb water AT ALL. I found it soaking wet top to bottom on the counter top an hour after I ran it under water. I would say that the beads and shell are at least as hard as my smoky quartz, but it appears the beads are hollow to some degree.

Alfredo Petrov August 10, 2018 10:11PM
Levi, you said you lack acids for testing, but even vinegar or lemon juice will work. You're going to have to test that piece with acid. I suspect it will fizz, but we need to be sure.
Douglas Schonewald August 10, 2018 10:11PM
No need for acid. Put a drop of vinegar on the crystals and let us know what happens. Try scratching the crystal with a knife point or the tip of a needle or pin (do this in an inconspicuous place if possible). Let us know what happens.
Wayne Corwin August 10, 2018 11:35PM
Welcome to Mindat Levi!

You'll have to look close for bubbles and they will be slow with vinegar or juice, but will show up better if you powder a small piece, then test.
V. Stingl August 11, 2018 01:53PM
Calcite, what else? Try the test the others mentioned, the rock will fizz!
Levi Forshee August 14, 2018 01:31AM
Hey guys, I found some more info.
So I believe I have sulfur crystals from a volcanic fumarole. In the acid, the rock matrix remains while the crystals effervesced. The crystals are vibrant yellow with the exterior removed by the acid. I did continue to let some crystals soak in the acid, and they dissolved completely!

I still can't seem to find any information on the matrix. Just a tease from a Smithsonian handbook I picked up from B&N. Copyright laws and what not, you'd have to find the book for yourself. The matrix in their specimen from Cadiz was spot on with what I found. It can't be that uncommon, right?
Kevin Conroy August 14, 2018 01:59AM
From what you describe it's almost certainly either calcite or aragonite.
Alfredo Petrov August 14, 2018 03:42AM
I agree with Kevin that you almost surely have found calcite or aragonite. Sulphur does not effervesce or dissolve in acids.
Matt Neuzil August 14, 2018 04:40AM
Don't go on color alone. Calcite comes in a variety of colors.
Scott Rider August 14, 2018 06:00PM
If you can get back to that spot, I'd say keep digging in the direction the "calcite" is going. You may be able to find some large, nice crystals!! I've found calcite veins in various parts of Colorado, and sometimes those veins can yield good crystals. Sometimes, they don't! And, sometimes solid calcite could be hiding other minerals!! Calumet Mine, Colorado has many minerals, and most are found by dissolving the calcite to reveal the other minerals. I don't think what you have is that, but if you dig further you may run into a vein hiding other minerals!! But I think you have a pretty good spot, so keep digging if you are able too!!!

Also, with your testing, I agree you have calcite/aragonite. I personally love calcite, its one of my favorite minerals, partly because I can find some here in Colorado, but mostly because it has so many crystal shape/forms making it quite a unique mineral!!!
Levi Forshee August 15, 2018 11:57PM
Awesome! I appreciate all the help guys! I'll definitely keep looking for more stuff when i end up out there again. Took home some opal from Spencer today to add to my growing collection.
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