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light purple mineral
  
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fuss




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PostPosted: May 15, 2019 23:24    Post subject: light purple mineral  

I saw this in a rock that I had broken in half, it is extremely small (pinhead size), so not much testing I can think of to do to it. The rock is a syenite with k-feldspar and maybe a bit of plagioclase and some hornblende, no quartz. I realize without tests and from these images its tough to say what it may be but wondering if anyone had any thoughts?


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fuss




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PostPosted: May 15, 2019 23:25    Post subject: Re: light purple mineral  

pic 2


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Tobi




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PostPosted: May 16, 2019 00:41    Post subject: Re: light purple mineral  

fuss wrote:
[...]wondering if anyone had any thoughts?
Yes, I have the thought that providing the locality of this rock would make it much easier ...
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fuss




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PostPosted: May 16, 2019 06:40    Post subject: Re: light purple mineral  

well that is a good thought..it came from the shore of lake Michigan in Milwaukee county Wi.



Tobi wrote:
fuss wrote:
[...]wondering if anyone had any thoughts?
Yes, I have the thought that providing the locality of this rock would make it much easier ...
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Bob Harman




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PostPosted: May 16, 2019 06:45    Post subject: Re: light purple mineral  

Like Tobi says, the guesses depend on its location, location, location. Now that I know it is from the beaches of the Great Lakes, this tiny 'pin head' bit of purple is probably one of the more common purple minerals in a rock left by the retreating glaciers, nos.
Bob
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Kevin Conroy




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PostPosted: May 16, 2019 07:27    Post subject: Re: light purple mineral  

My first guess is fluorite. Can you see a cleavage plane under magnification?
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fuss




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PostPosted: May 16, 2019 12:31    Post subject: Re: light purple mineral  

I cannot discern any cleavage planes with a 10x loupe that I use. They do fluoresce brilliant purple under 365nm long wave uv though, but my other fluorite all fluoresces blue.



Kevin Conroy wrote:
My first guess is fluorite. Can you see a cleavage plane under magnification?
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