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Post by th30utkast3d on Apr 21, 2011 18:53:51 GMT -5
So today me and the kids found some cool by the railroad tracks. My son brought me this one. I looked in my Wisconsin mineral and rocks book and it shows nothing that matched it. Really shiney and silver.  I took some of the crystal and put it into Vinager and nothing, so my quess is it is not calcite but maybe quartz. but what is this silver stuff?  I have narrowed my opinions to antimony, galena or manganite |
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Post by arappaho on Apr 21, 2011 22:44:05 GMT -5
That stuff "usually" is a mixture of mica, that makes it shiny,
and some amphibole minerals, but it depends a lot on what rocks
are native to your area.
(I'm just talking about the thin dark layer on the quartz.)
Joe
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Post by th30utkast3d on Apr 25, 2011 14:44:39 GMT -5
I have googled a few different native rocks with Mica and amphibole minerals and really have not found anything like it. Some of the pictures show a more of a grey color over a silver color. This is REALLY silvery. Not that i doubt your info because I am a super noob. Any other ideas?
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Post by colorshapetexture on Apr 25, 2011 14:57:49 GMT -5
No ... That's what it is.. Mica.
Some mica is to the green side to. It is really pretty.
I still have some of my beginning collection. And I found one like that and have held on to it as it was part of the learning process. And well its a sentimental rock. And it goes right out there with the rest of the 100s+ pounds of my collection. I love them all. lol
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Post by chemfreak on Apr 25, 2011 15:07:02 GMT -5
This is known as a micaceous schist. Micaceous schist are formed due to metamorphism, not sedimentation.
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Post by arappaho on Apr 25, 2011 15:48:22 GMT -5
Yeah, outkast, we're all trying to learn here.  One more thing for you to read up on..... I'm not positive if your rock is an example of it, but if you do a little reading about "slickensides", it might help you to understand what's going on with that shiny layer on your rock find. Joe |
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Post by th30utkast3d on Apr 26, 2011 13:33:50 GMT -5
Thanks arappaho for the help. I didnt want to sound like i was saying you did not know. Learning new stuff everyday. I would have never learned about slickensides until you mentioned it. Well I would have eventually but thanks for all the help. I love this piece, it is cool to look at and now after reading up on the minerals and slickensides it is more interesting and nice to know how it became that way. thanks to everyone that has posted.
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