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Crystal cavity + green vein poss. chlorite?
  
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Kara




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PostPosted: Aug 19, 2018 08:29    Post subject: Crystal cavity + green vein poss. chlorite?  

A nice memory from recent fly-fishing trip in Lappland. Finland.

This was too big to carry so I just enjoyed a cup of coffee on it and left it there - so no tests can be done. The green vein consisted of tiny granules and was very soft so I think it could have been chlorite, the blue quartz-type vein maybe cordierite and the larger crystals in the cavity maybe quartz. Please correct me if I am totally wrong.

Kara

ps. The last two pictures are from a funny shaped "flower"-thingie on another close rock. What can this be?



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the rock
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view from the coffee cup. See the scratch marks on the green mineral, they were easily made with a house key.
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green, white and blue, what can they be?
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cavity with crystals of quartz (?)
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fractured crystal
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flower-thingie up close
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Peter Megaw
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PostPosted: Aug 19, 2018 08:48    Post subject: Re: crystal cavity + green vein poss. chlorite?  

Sounds like "catch and release " extended to the rocks too.
Maybe these will keep growing?

Sure looks like chlorite Kara...

I think your flower thingie is a broken radiating group of quartz crystals...but there are plenty of metamorphic alternatives.

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Peter Lemkin




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PostPosted: Aug 19, 2018 13:03    Post subject: Re: Crystal cavity + green vein poss. chlorite?  

4,5,6 show some quite large and eroded quartz crystals in that cavity. It looks to me like there was also possibly an eroded band of some metal ore...but hard to tell just from a photo. You seem to have a way of attracting crystals wherever you go in Finland.....
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Peter Megaw
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PostPosted: Aug 19, 2018 13:27    Post subject: Re: Crystal cavity + green vein poss. chlorite?  

Peter is right...there was a sulfide present...probably pyrite based on the color of the iron oxides
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Kara




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PostPosted: Aug 19, 2018 14:07    Post subject: Re: Crystal cavity + green vein poss. chlorite?  

Thank you my helpful Peters! Peter M the "catch and release"- thing was so funny, I had a sweet laugh! And Peter L thank you also for yesterday's skarn post, I will start a field rock hunt. I am a crystal bait :) :)

And now.... I am so ashamed.... It must be dementia or something.. I DID take a smaller rock from that beach with me, just realized I had it in the garden! So quick photos and tadaa, here you can see some smaller green and brown crystals below the chlorite and white mineral. What could these be?



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Peter Lemkin




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PostPosted: Aug 20, 2018 03:06    Post subject: Re: Crystal cavity + green vein poss. chlorite?  

Sadly most minerals are not like plants - that an expert who knows what all plants looks like can then tell you the species. Many minerals look alike - many minerals can have many colors or even many crystal habits. There are ways of testing to get a better idea what something is: hardness, scratch test on unglazed porcelain of fuse casing, specific gravity, others tests...many of the more common ones are listed here on the website - and how to do such tests.

I myself would really not want to make a guess on the dark green crystals - they may be epidote and they could be a lot of other things too. I suggest you take a piece off and do some tests on it.

With minerals, often, photos alone do not suffice....but there are exceptions to that rule.
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Kara




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PostPosted: Aug 20, 2018 04:17    Post subject: Re: Crystal cavity + green vein poss. chlorite?  

Yes Peter, I am sorry for not doing those at the first place. The greens are so tiny it is hard to get some out for gravity test without destroying them. They leave no streak on porcelain, and a steel knife makes a scrath to them. There are very thin plate-like crystals and broader angular ones.
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