|
|
Post by helens on Jan 12, 2013 1:02:36 GMT -5
When all seen together... Krystee's, Dragon Skin #1 and #2 all have one darkened 'center' part where the cells begin radiating from, 'laying down', sort of like scales or a fan, overlapping edges.
|
|
|
|
Post by helens on Jan 12, 2013 1:06:13 GMT -5
And I have to point out... I know I'm pretty new to rocks, so I am NOT arguing with you guys about rocks, types of rocks, etc.
Just trying to understand what rock you are saying it is, or what natural effect it could be if NOT manmade.
|
|
|
|
Post by helens on Jan 12, 2013 19:04:43 GMT -5
Ok... today, I had a DOH! moment... When I quenched, I was CREATING fractures obviously. What was I thinking that the fractures would not fall out if the cracks were 'closed'? So I THINK I am finally getting what you 2 were trying to tell me (correct me if mistaken)... This COULD be a natural phenomenon, exactly the way fossil dino bone forms, simply by heat cracking an agate, and then the cells FILLED IN WITH AGATE in a natural process, the way that the dino bone filled in the cells, then later when the harder organic calcium deteriorated, filled up the outlines with agate too (or at the same time, and the cell color difference was due to the material reacting with the solid calcium portions of the bone causing a difference in color). Quenched ARE filled in with non-agate material, they have to be. And I have been thinking about this too... it's not really possible for it to be something like epoxy or opticon, the diffraction would be way off and noticeable when polish, even if vaccum injected. So I thought of something I had read some time ago... water glass, or sodium silicate. From Wiki: en.wikipedia.org/wiki/Sodium_silicateSodium silicate is the common name for a compound sodium metasilicate, Na2SiO3, also known as water glass or liquid glass. It is available in aqueous solution and in solid form and is used in cements, passive fire protection, refractories, textile and lumber processing, and automobiles. Sodium carbonate and silicon dioxide react when molten to form sodium silicate and carbon dioxide:[1]
Na2CO3 + SiO2 ? Na2SiO3 + CO2
Anhydrous sodium silicate contains a chain polymeric anion composed of corner shared {SiO4} tetrahedral, and not a discrete SiO32- ion.[1] In addition to the anhydrous form, there are hydrates with the formula Na2SiO3·nH2O (where n = 5, 6, 8, 9) which contain the discrete, approximately tetrahedral anion SiO2(OH)22- with water of hydration. For example, the commercially available sodium silicate pentahydrate Na2SiO3·5H2O is formulated as Na2SiO2(OH)2·4H2O and the nonahydrate Na2SiO3·9H2O is formulated as Na2SiO2(OH)2·8H2O.[2]
I'm only guessing that this is what they used of course, but it would make sense. This would have a very low viscosity, but should dry almost or as hard as a mineral, with at least close to the refractive qualities of glass. This would solve the problem of a perfect refractive polish, without an impossible glass 'coating' (unless you are cold sealing glass to a rock, ie., with epoxy, you are NOT laying molten 1750 degree glass on a mineral without destroying/damaging that mineral, and this includes diamonds- that experiment has been tried and failed, not by me). Anyway, I'm satisfied it's POSSIBLE naturally, and also how it may have happened. I'm also satisifed how it MIGHT be done artificially, even if I didn't complete the process. Unless someone else wants to go play with waterglass (*cough* maybe Daniel, who has some of the mad scientist bend) - which you can buy from many science stores too - it's powdered sodium silicate, or sodium orthosilicate or sodium pyrosilicate to test (these all dissolve in water and will be glassy and colorless), I'm done with the experiment and my scientific curiosity about this is settled:P. This mostly because I have a batch of Jamesp's coral cooking in the kiln as I type, and I'm more curious about that at the moment:P. |
|
|
|
Post by glennz01 on Aug 7, 2018 14:49:59 GMT -5
Seeing how this isn5 answered it's basically crystals tat tried to grow but never separated. Find that lots up here
|
|
|
|
Post by vegasjames on Aug 7, 2018 18:51:34 GMT -5
I see there is a claim that because agate is microcrytalline that it does not fracture like glass. Actually agate can be heated and cooled rapidly to create microfractures. This is the basic for the production of fake black agate. A clear or white chalcedony (agate is a chalcedony)is heated then rapidly cooled in water to create mucrofracturing to make it more porous. Then the chalcedony is soaked in a sugar solution for weeks then soaked in sulfuric acid to carbonize the sugar that worked its way in to the chalcedony to make the chalcedony appear black.
|
|
|
|
Post by vegasjames on Aug 7, 2018 18:53:57 GMT -5
Daniel, maybe my pictures weren't very clear... the 'carnelian' (IS it a carnelian??) is very cell like... the photo isn't very clear of it, but to the eye, it looks like the 'dragon skin' agate that's sold in jewelry. Keeping in mind that I hit it with a torch, which is not even heating, and done quickly just to see the reaction, the portions not directly in the heat (but were radiantly heated) celled up pretty nicely anyway (with the smaller cells closer to the heat source). If it were brought up evenly heated in a controlled kiln to an as yet unknown temp... once held at that temp for say 1/2 an hour til the temperature is even throughout the rock, then yanked out of the kiln and popped into water... VOILA!!! Even cells. Closeup:  What remains to be seen before pursuing that (and I can't really, I don't want to crackle my blood red carnelians, that's the only off-colored one I had), is whether it will cab showing the crackles, or will fracture to pieces during grinding... What would be interesting is if you treated the rocks in the same manner in which they create tempered glass then when cooled use a punch to see if the stone will crack in cells like tempered glass. |
|
|
|
Post by vegasjames on Aug 7, 2018 19:04:49 GMT -5
Ok... today, I had a DOH! moment... When I quenched, I was CREATING fractures obviously. What was I thinking that the fractures would not fall out if the cracks were 'closed'? So I THINK I am finally getting what you 2 were trying to tell me (correct me if mistaken)... This COULD be a natural phenomenon, exactly the way fossil dino bone forms, simply by heat cracking an agate, and then the cells FILLED IN WITH AGATE in a natural process, the way that the dino bone filled in the cells, then later when the harder organic calcium deteriorated, filled up the outlines with agate too (or at the same time, and the cell color difference was due to the material reacting with the solid calcium portions of the bone causing a difference in color). Quenched ARE filled in with non-agate material, they have to be. And I have been thinking about this too... it's not really possible for it to be something like epoxy or opticon, the diffraction would be way off and noticeable when polish, even if vaccum injected. So I thought of something I had read some time ago... water glass, or sodium silicate. From Wiki: en.wikipedia.org/wiki/Sodium_silicateSodium silicate is the common name for a compound sodium metasilicate, Na2SiO3, also known as water glass or liquid glass. It is available in aqueous solution and in solid form and is used in cements, passive fire protection, refractories, textile and lumber processing, and automobiles. Sodium carbonate and silicon dioxide react when molten to form sodium silicate and carbon dioxide:[1]
Na2CO3 + SiO2 ? Na2SiO3 + CO2
Anhydrous sodium silicate contains a chain polymeric anion composed of corner shared {SiO4} tetrahedral, and not a discrete SiO32- ion.[1] In addition to the anhydrous form, there are hydrates with the formula Na2SiO3·nH2O (where n = 5, 6, 8, 9) which contain the discrete, approximately tetrahedral anion SiO2(OH)22- with water of hydration. For example, the commercially available sodium silicate pentahydrate Na2SiO3·5H2O is formulated as Na2SiO2(OH)2·4H2O and the nonahydrate Na2SiO3·9H2O is formulated as Na2SiO2(OH)2·8H2O.[2]
I'm only guessing that this is what they used of course, but it would make sense. This would have a very low viscosity, but should dry almost or as hard as a mineral, with at least close to the refractive qualities of glass. This would solve the problem of a perfect refractive polish, without an impossible glass 'coating' (unless you are cold sealing glass to a rock, ie., with epoxy, you are NOT laying molten 1750 degree glass on a mineral without destroying/damaging that mineral, and this includes diamonds- that experiment has been tried and failed, not by me). Anyway, I'm satisfied it's POSSIBLE naturally, and also how it may have happened. I'm also satisifed how it MIGHT be done artificially, even if I didn't complete the process. Unless someone else wants to go play with waterglass (*cough* maybe Daniel, who has some of the mad scientist bend) - which you can buy from many science stores too - it's powdered sodium silicate, or sodium orthosilicate or sodium pyrosilicate to test (these all dissolve in water and will be glassy and colorless), I'm done with the experiment and my scientific curiosity about this is settled:P. This mostly because I have a batch of Jamesp's coral cooking in the kiln as I type, and I'm more curious about that at the moment:P. Couple of things to keep in mind with sodium silicate.
First of all if the stone gets heated such as putting it in a setting the sodium silicate will expand in to a hard white foam.
Secondly, the sodium silicate can react with some minerals turning the sodium silicate white and crusty.
|
|
Nov 12, 2024 9:54:37 GMT -5
Nov 12, 2024 9:54:37 GMT -5
Nov 14, 2024 18:17:57 GMT -5
*
Nov 14, 2024 18:17:57 GMT -5
*
Nov 15, 2024 17:44:51 GMT -5
Nov 15, 2024 17:44:51 GMT -5
