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Green seam. Looks like it in a state of decay.
  
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Ning




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PostPosted: Mar 18, 2024 08:12    Post subject: Green seam. Looks like it in a state of decay.  

Found in Koh Phangan, Thailand up in the hills in an old road dig site. There’s a lot of decaying granite. Pegmatites around with quartz, schorl, beryl (light green and aquamarine), feldspar (white, blue and pink).

I’ve found a couple of seams of this stuff. It’s quite decayed so can’t see any crystal habit or tell its luster. It’s bright lime green in colour when wet, becomes a bit more desaturated to semi pastel lime when dry.

Apparently, the island used to be mined for tin back in the day. But I can’t confirm this with geology reports. A few older Thai friends told me they used to get paid to find black stones in the rivers. Thinking this could have been massive cassiterite?



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James Catmur
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PostPosted: Mar 19, 2024 08:54    Post subject: Re: Green seam. Looks like it in a state of decay.  

You would need to test the rocks from the vein for minerals
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Forrestblyth




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PostPosted: Mar 19, 2024 08:59    Post subject: Re: Green seam. Looks like it in a state of decay.  

To me if it is in an area that has copper ore present it has the feel of Pyromorphite or mimetite. But you would need close up shots of crystals of some for to even hazard a meaningful guess
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alfredo
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PostPosted: Mar 19, 2024 10:06    Post subject: Re: Green seam. Looks like it in a state of decay.  

More likely epidote, which is not uncommon as veins and fracture coatings in altered granites.
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Ning




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PostPosted: Mar 21, 2024 22:45    Post subject: Re: Green seam. Looks like it in a state of decay.  

James Catmur wrote:
You would need to test the rocks from the vein for minerals


Thank for the reply. Will take them to singapore to get them tested when i take the pink quartz / indicolite combo. Should be next week.
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Ning




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PostPosted: Mar 21, 2024 22:47    Post subject: Re: Green seam. Looks like it in a state of decay.  

alfredo wrote:
More likely epidote, which is not uncommon as veins and fracture coatings in altered granites.


Oh, would love to find some epidote crystals!
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Ning




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PostPosted: Mar 21, 2024 22:49    Post subject: Re: Green seam. Looks like it in a state of decay.  

Forrestblyth wrote:
To me if it is in an area that has copper ore present it has the feel of Pyromorphite or mimetite. But you would need close up shots of crystals of some for to even hazard a meaningful guess


I haven’t seen any evidence of copper or at least my untrained eye hasn’t. It’s been suggested pyromorphite by a few folks.
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