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Agate-Bastinae-Granite?
  
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NewGreenHelp




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PostPosted: May 02, 2019 10:17    Post subject: Agate-Bastinae-Granite?  

Hello everyone,
Please forgive me as I am new. Have been looking around trying to identify these this rock. that I found. Its dense but a bit crumbly. I can not match them and its frustrating. Bastinae, granite, Agate? Can anyone point me in the right direction please? Thanks so much.



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Kevin Schofield




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PostPosted: May 02, 2019 10:47    Post subject: Re: Agate-Bastinae-Granite?  

NewGreenHelp wrote:
Hello everyone,
Please forgive me as I am new. Have been looking around trying to identify these this rock. that I found. Its dense but a bit crumbly. I can not match them and its frustrating. Bastinae, granite, Agate? Can anyone point me in the right direction please? Thanks so much.


Lots of (pink) orthoclase feldspar, (grey) quartz and (shiny flaky) mica. Granite would seem to be a good generic name to me,

Going to pass on the green hexagonal thing, which does not look as if it belongs...

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NewGreenHelp




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PostPosted: May 02, 2019 10:57    Post subject: Re: Agate-Bastinae-Granite?  

Thanks you so much!
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Pete Modreski
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PostPosted: May 02, 2019 11:03    Post subject: Re: Agate-Bastinae-Granite?  

I'll certainly agree, in a simple word, the rock looks like granite.

The crystal--which does seem odd and perhaps out of place, just growing on the granite look that, with no evidence of a pocket (vug, cavity) lined with coarser grained crystals, could indeed be the mineral bastnaesite (is that what you were trying to write?), which is hexagonal and often has that shape and color appearance.

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NewGreenHelp




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PostPosted: May 02, 2019 11:18    Post subject: Re: Agate-Bastinae-Granite?  

Hello sir,

Thank you for your reply. Yes regarding bastinae but I have no idea. I was actually more interested in the whole rock. Thank you sir.
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NewGreenHelp




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PostPosted: May 02, 2019 11:23    Post subject: Re: Agate-Bastinae-Granite?  

Say, while I have you gentlemen looking, would this be granite as well? I'm very happy to identify these rocks as I can not find a match.


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Peter Lemkin




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PostPosted: May 03, 2019 01:55    Post subject: Re: Agate-Bastinae-Granite?  

NewGreenHelp wrote:
Hello sir,

Thank you for your reply. Yes regarding bastinae but I have no idea. I was actually more interested in the whole rock. Thank you sir.


It strikes me as strange that you find the 'whole rock' more interesting than the well-defined crystal, which I, as well as others sense doesn't 'belong' there - and might have been glued there [or if naturally there, is BY FAR AND AWAY MUCH more important than that very ordinary rock......] I would think that would be apparent even to someone new to mineralogy.
I just sense something strange, even your not correcting the spelling in your last post. Each to his own.... I strongly sense that crystal was attached by human action - try a close-up from the side of the crystal showing the attachment point[s].
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Kevin Schofield




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PostPosted: May 03, 2019 08:29    Post subject: Re: Agate-Bastinae-Granite?  

NewGreenHelp wrote:
Say, while I have you gentlemen looking, would this be granite as well? I'm very happy to identify these rocks as I can not find a match.


This too looks to belong to the "granite family", with what seems to be a mix of feldspar, quartz and mica. It is clearly finer-grained (smaller crystals) and looks to have a greater predominance of white feldspar, indicating likely more plagioclase feldspar (sodium-calcium composition) than the pink (orthoclase, potassic) feldspar. There may also be less quartz (grey), so the composition is less acidic. It might, therefore, be classified as a "granodiorite" rather than a granite.

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PostPosted: May 03, 2019 11:52    Post subject: Re: Agate-Bastinae-Granite?  

Thank you so much for your thorough analysis !!
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