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In what direction do I cut my Agate?
  
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GabiG




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PostPosted: Mar 03, 2020 10:36    Post subject: In what direction do I cut my Agate?  

Hello :-) I found what I think is an Agate and I would like to cut it open or slice it to see what's inside, but I don't know how to identify the direction of the banding. I found this rock on a beach on the Isle of Man (UK). There are some moss-like features on one side of the rock, and possibly some banding on another face. I marked the rock with two lines (1 and 2) showing the directions of cuts which I thought might be right, but I'm not sure which one I should use. I would really appreciate your help! :-) Many thanks.


1 Moss-like feature on Agate a.JPG
 Mineral: Agate
 Dimensions: 800mm x 400mm
 Description:
Moss-like feature on one face of the Agate.
 Viewed:  1485 Time(s)

1 Moss-like feature on Agate a.JPG



2 Moss-like feature on Agate b.JPG
 Mineral: Agate
 Dimensions: 800mm x 400mm
 Description:
Moss-like feature on one side of the Agate.
 Viewed:  1486 Time(s)

2 Moss-like feature on Agate b.JPG



3 Moss-like feature on Agate c.JPG
 Mineral: Agate
 Dimensions: 800mm x 400mm
 Description:
Moss-like feature on face of the Agate.
 Viewed:  1486 Time(s)

3 Moss-like feature on Agate c.JPG



4 Moss-like feature on Agate d.JPG
 Mineral: Agate
 Dimensions: 800mm x 400mm
 Description:
Moss-like feature on one side of the Agate.
 Viewed:  1485 Time(s)

4 Moss-like feature on Agate d.JPG



5 Banding on Agate a.JPG
 Mineral: Agate
 Dimensions: 800mm x 400mm
 Description:
Banding on the face next to the moss-like feature face on the Agate.
 Viewed:  1484 Time(s)

5 Banding on Agate a.JPG



6 Banding on Agate b.JPG
 Mineral: Agate
 Dimensions: 800mm x 400mm
 Description:
Banding on the face next to the moss-like feature face on the Agate.
 Viewed:  1485 Time(s)

6 Banding on Agate b.JPG



7 Banding on Agate c.JPG
 Mineral: Agate
 Dimensions: 800mm x 400mm
 Description:
Banding on the face next to the moss-like feature face on the Agate.
 Viewed:  1484 Time(s)

7 Banding on Agate c.JPG



8 Opposite from Banding feature.JPG
 Mineral: Agate
 Dimensions: 800mm x 400mm
 Description:
Opposite face from Banding feature on Agate.
 Viewed:  1486 Time(s)

8 Opposite from Banding feature.JPG



9 Opposite from banding and moss feature.JPG
 Mineral: Agate
 Dimensions: 800mm x 400mm
 Description:
Opposite/diagonal face from Banding and Moss-like features on Agate.
 Viewed:  1485 Time(s)

9 Opposite from banding and moss feature.JPG


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Bob Harman




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PostPosted: Mar 03, 2020 11:15    Post subject: Re: In what direction do I cut my Agate?  

Uncut agates, are like unopened hollow geodes. You cannot tell the best orientation of the banding patterns or crystals on their inside . In my experience, the best way is to open your agate is to show the largest surface area on its cut side. BOB
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GabiG




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PostPosted: Mar 03, 2020 11:46    Post subject: Re: In what direction do I cut my Agate?  

Thank you :-) I suppose that would mean cutting it along my "green line 2" . The moss-like feature has the larger surface area. The stone is an odd sort of shape and is really colorful with interesting features. But the moss feature is really pretty. It would be a shame to cut through it also.
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Daniel Bennett




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PostPosted: Mar 03, 2020 14:03    Post subject: Re: In what direction do I cut my Agate?  

It's a good question to ask. I have ruined a few cutting them wrong. Usually if it's a whole nodule, unbroken anywhere, it can be a tough decision to make. In your case it has a few "windows" where it broke and you can see what's inside it. It doesn't seem to be a traditional style agate. Maybe it's banded chert. You can expect the inside to look about like what it looks like on its broken faces. Maybe if you cut right through the middle you may find some more banding but I wouldn't count on it. Another approach is to keep slicing/grinding it where you see banding until you get to a sweet spot and stop there and keep it as a half nodule. Hope that helps
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GabiG




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PostPosted: Mar 04, 2020 04:43    Post subject: Re: In what direction do I cut my Agate?  

Thank You :-) Yes, I thought it might be chert as well, but I was told it was Agate. The very dark stone visible on the broken face with the moss feature reminds me of flint. Anyway, it will be interesting to have a look inside. Actually, like you suggest, it wouldn't surprise me either to find more flint inside and not much banding. But it helps to know where to cut it to begin with! :-D I think I will cut it in a way to keep the moss feature intact because I like it. I've never cut Agates before, so it's a learning experience, and hopefully if I find more like this one, I will be able to learn to better analyse features on this type of stone or banded chert to help me in the future. I've got some translucent Agates and they are much easier to inspect with a light behind them. Not possible with this one of course. Thank you again. Much appreciated.
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vic rzonca




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PostPosted: Mar 04, 2020 10:33    Post subject: Re: In what direction do I cut my Agate?  

In a case like this, when you come to a fork in the road, take it. This may apply to your problem, GabiG.


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GabiG




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PostPosted: Mar 04, 2020 12:42    Post subject: Re: In what direction do I cut my Agate?  

Does that mean cutting at a different angle if first cut points me to that direction? :-)
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vic rzonca




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PostPosted: Mar 04, 2020 13:57    Post subject: Re: In what direction do I cut my Agate?  

GabiG wrote:
Does that mean cutting at a different angle if first cut points me to that direction? :-)

Some contractors I've known followed the "Why do it right, if you can do it twice." rule. You could grind a flat on it to tell you more. Now, I must ask forgiveness from whom it may concern, for my trespass into anything lapidary. I submit myself for your derision.;-)
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rweaver




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PostPosted: Mar 04, 2020 14:37    Post subject: Re: In what direction do I cut my Agate?  

vic rzonca wrote:
GabiG wrote:
Does that mean cutting at a different angle if first cut points me to that direction? :-)

Some contractors I've known followed the "Why do it right, if you can do it twice." rule. You could grind a flat on it to tell you more. Now, I must ask forgiveness from whom it may concern, for my trespass into anything lapidary. I submit myself for your derision.;-)


What can be said about your comment. I bet a lot of us on here did some form of lapidary before moving onto collecting minerals. I for one started out cabbing and moved onto learning how to facet before I joined the Navy as a teenager. My parents had both of the machines at home and we where members of the San Diego Mineral and Gem Society. Thanks for bringing back the memories of my youth.
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GabiG




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PostPosted: Mar 05, 2020 04:22    Post subject: Re: In what direction do I cut my Agate?  

Thank you again! :-)
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