eruyanik
starting to shine!
Member since March 2018
Posts: 32
|
Post by eruyanik on Apr 5, 2018 12:48:50 GMT -5
|
|
|
Post by pauls on Apr 5, 2018 16:11:13 GMT -5
Hi eruyanik
I think the colour could be an Iron stain just on the outside. The rock itself could be Quartz or Quartsite or possibly Agate.
The striking vibrant colour is usually caused by it being a white rock underneath reflecting light back through the thin rust stain. It is quite common, most of the people doing tumbling here would have put a nice coloured rock in and taken out a completely different coloured rock a week later when the stain has tumbled off.
That is just a guess, the only way to tell with waterworn specimens is to have a look inside by grinding a small piece or cutting it in half. Hitting it with a hammer would be another option that I guess you wouldn't be too keen on. A freshly broken specimen gives us an idea about how it fractures, perhaps fresh crystals and fresh colour.
Paul
|
|
eruyanik
starting to shine!
Member since March 2018
Posts: 32
|
Post by eruyanik on Apr 5, 2018 18:06:38 GMT -5
Hi eruyanik I think the colour could be an Iron stain just on the outside. The rock itself could be Quartz or Quartsite or possibly Agate. The striking vibrant colour is usually caused by it being a white rock underneath reflecting light back through the thin rust stain. It is quite common, most of the people doing tumbling here would have put a nice coloured rock in and taken out a completely different coloured rock a week later when the stain has tumbled off. That is just a guess, the only way to tell with waterworn specimens is to have a look inside by grinding a small piece or cutting it in half. Hitting it with a hammer would be another option that I guess you wouldn't be too keen on. A freshly broken specimen gives us an idea about how it fractures, perhaps fresh crystals and fresh colour. Paul thank you very much for this detailed explanation, Paul, which i highly appreciated! rust is a possible reason, but on this one it is all over with a felt and depth. it is also unusually shiny. so it is better to window it or breaking it like you have said, but also it is not a easy decision as for me,like you have said too;) greetings, Ersin
|
|
eruyanik
starting to shine!
Member since March 2018
Posts: 32
|
Post by eruyanik on Apr 5, 2018 19:15:38 GMT -5
by the way i checked it with a magnifier again and i have seen some purple base or the inclusions under it. so rust on the surface is very possible.
you can also see with a closer look, the tiny purple points are there within the photos too.
|
|
|
Post by pauls on Apr 5, 2018 23:35:35 GMT -5
You sometimes get purple, rainbows sometimes too in very fine fractures in Quartz, it is due to the fracture working like a prism and refracting some of the wavelengths of light, a bit like an oil slick on water.
|
|
|
Post by 1dave on Apr 6, 2018 1:41:41 GMT -5
The iron could have been present when the rock was forming and therefore being clear through. The only way to know for sure is to "LAPIDATE" it.
|
|
Fossilman
Cave Dweller
Member since January 2009
Posts: 20,685
|
Post by Fossilman on Apr 6, 2018 9:05:04 GMT -5
Cut it......
|
|
eruyanik
starting to shine!
Member since March 2018
Posts: 32
|
Post by eruyanik on Apr 10, 2018 14:20:52 GMT -5
guys i kept going to polish more and more and i see that the rusty layer becomes thinner and thinner, so i see some green patches under it here and there.
a green rock with the rust on it. serpentine or another kind.
thank you to all!
|
|
|
Post by mohs on Apr 10, 2018 17:04:42 GMT -5
excluding that its not a potato i'll say underneath that oxide skin is some sort of lime trying to marbleize
|
|