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Ning
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Posted: Mar 18, 2024 08:12 Post subject: Green seam. Looks like it in a state of decay. |
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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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Posted: Mar 19, 2024 08:54 Post subject: Re: Green seam. Looks like it in a state of decay. |
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You would need to test the rocks from the vein for minerals
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Forrestblyth
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Posted: Mar 19, 2024 08:59 Post subject: Re: Green seam. Looks like it in a state of decay. |
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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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Posted: Mar 19, 2024 10:06 Post subject: Re: Green seam. Looks like it in a state of decay. |
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More likely epidote, which is not uncommon as veins and fracture coatings in altered granites.
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Ning
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Posted: Mar 21, 2024 22:45 Post subject: Re: Green seam. Looks like it in a state of decay. |
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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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Posted: Mar 21, 2024 22:47 Post subject: Re: Green seam. Looks like it in a state of decay. |
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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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Posted: Mar 21, 2024 22:49 Post subject: Re: Green seam. Looks like it in a state of decay. |
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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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