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pink and green mineral ID question
  
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Kara




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PostPosted: Aug 12, 2018 11:52    Post subject: pink and green mineral ID question  

Hello again! I found some colourful rocks today. Could you please be so kind again and help me to identify them.

1) The pink and white pegmatites (?) seem to have rosy quartz and green apatite. Do you agree or are there other possibilities?

2) The large gneiss/migmatite (?) boulder also has pink minerals, but they look a bit different from the pegmatite pinks. They are somewhat brittle, but do not react to vinegar. Also rosy quartz?

3) The granulites have something of light green in them. What can it be?

Thank You! (from Finland)



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Pete Modreski
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PostPosted: Aug 12, 2018 14:06    Post subject: Re: pink and green mineral ID question  

I'll offer a first try at answering you, Kara, and we'll see if anyone else has some suggestions.

I think the pink mineral in both (1) and (2) is pretty surely rose quartz. And yes, in (1), the very tiny blue-green grains are likely apatite.

In the gneiss/granulite, you didn't mention the darker red grains, which (you probably knew) are garnet. But the pale yellowish-green patches could be a number of things. Patches of dense, fine-grained muscovite ("sericite") (which is often this color) are one possibility--are they soft enough to scratch easily? If not, well, there are quite a number of silicate minerals that could be this color. I won't try to offer any guesses, for the moment!
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Kara




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PostPosted: Aug 12, 2018 15:00    Post subject: Re: pink and green mineral ID question  

Thank You very much Pete!
Tested and the green makes a scratch to glass, and a steel knife makes a scratch to the green mineral, so hardness is 5.5-6? Here are zoomed pics taken with a cell phone camera: the colours are bit off but the structure can be seen.



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Justin Hickok




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PostPosted: Aug 12, 2018 15:38    Post subject: Re: pink and green mineral ID question  

Kara, I'm wondering what the dark brown blob is to the left side of the rock in the second image down.
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Pete Modreski
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PostPosted: Aug 12, 2018 16:57    Post subject: Re: pink and green mineral ID question  

One of my guesses for the possible identity of the pale green mineral is scapolite (given that it appears to be clearly too hard to be mica, and so presumably not apatite either). Some other possibilities--minerals found in metamorphic rocks that might look like that--vesuvianite (idocrase), diopside (low in iron, hence pale color)... well, those are the several that first come to mind.
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Kara




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PostPosted: Aug 14, 2018 11:42    Post subject: Re: pink and green mineral ID question  

Thank you Pete very much for your help! I have been searching for scapolite photos and they do look very much the same. I am just now giving the green ones a vinegar bath so I can take better photos of cleaner samples, and try to find clues from the structures.

And Justin, I think the blob is soil/dirt. The rock was on a steep slope. :)
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