Jake7291 19 Posted October 31, 2019 I am reposting this stone I found in the field a while ago that is still yet to be identified. Green round spots are all over the interior, with red round spots near the surface. No streak, guessing it's a type of quartz. When rubbed with mineral oil, the green spots closest to the surface leak? They seem to stain the paper towel green. Will update with pictures of a slice with light under it. Quote Share this post Link to post Share on other sites
Bedrock Bob 3,283 Posted October 31, 2019 Leakerite? Quote Share this post Link to post Share on other sites
Jake7291 19 Posted October 31, 2019 13 minutes ago, Bedrock Bob said: Leakerite? ...was that an attempt at a joke? Quote Share this post Link to post Share on other sites
Bedrock Bob 3,283 Posted October 31, 2019 1 minute ago, Jake7291 said: ...was that an attempt at a joke? Yes. We're you not titilated? 1 Quote Share this post Link to post Share on other sites
Jake7291 19 Posted October 31, 2019 7 minutes ago, Bedrock Bob said: Yes. We're you not titilated? Slightly, but I still kind of wanted real help with figuring it out. 1 Quote Share this post Link to post Share on other sites
Bedrock Bob 3,283 Posted October 31, 2019 Then it is granite. You can be satisfied and amused at the same time now! Quote Share this post Link to post Share on other sites
Jake7291 19 Posted October 31, 2019 10 minutes ago, Bedrock Bob said: Then it is granite. You can be satisfied and amused at the same time now! This doesn't seem like granite to me, the round spots aren't separate pieces they are a coloration or maybe some sort of mineral stain? Here is a slice with a 60x close up from my jewlers loupe. Quote Share this post Link to post Share on other sites
Bedrock Bob 3,283 Posted October 31, 2019 Well, if you want to call it something other than granite then that is fine with me. Let me know what name you are satisfied with and I will change my vernacular to reflect the new naming conventions. Until then I will continue to use the term "granite" for this type of material. 1 Quote Share this post Link to post Share on other sites
Morlock 1,421 Posted October 31, 2019 Looks like some type of agate. There's probably thousands of different types worldwide and your specimen doesn't have enough characteristics to narrow it down to anything specific. Let's call it "generic agate". 2 Quote Share this post Link to post Share on other sites
Bedrock Bob 3,283 Posted October 31, 2019 I call cryptocrystalline silica that is translucent an agate. This specimen is obviously holocrystalline. That (in my book) makes it granitoid by definition. But I am just getting my info from the internet. I really don't know much about rocks. It could be a loaf of bread and I couldn't tell it from a biscuit. Quote Share this post Link to post Share on other sites
Jake7291 19 Posted October 31, 2019 1 hour ago, Bedrock Bob said: I call cryptocrystalline silica that is translucent an agate. This specimen is obviously holocrystalline. That (in my book) makes it granitoid by definition. But I am just getting my info from the internet. I really don't know much about rocks. It could be a loaf of bread and I couldn't tell it from a biscuit. This stone is translucent, I can see my fingers on the other side of my slice, not just the shadow but skin color as well. You looked at the close up photos right? I shined a light under it. I'm leaning towards agate as well, but I thought agates have bands. Quote Share this post Link to post Share on other sites
Morlock 1,421 Posted October 31, 2019 36 minutes ago, Jake7291 said: This stone is translucent, I can see my fingers on the other side of my slice, not just the shadow but skin color as well. You looked at the close up photos right? I shined a light under it. I'm leaning towards agate as well, but I thought agates have bands. From the internet.. "Agate is generally a banded material, and observing bands in a specimen of chalcedony is a very good clue that you have an agate. However, some agates do not have obvious bands. These are often translucent agates with plume-shaped, dendritic or mossy inclusions." 1 Quote Share this post Link to post Share on other sites
Jake7291 19 Posted October 31, 2019 3 minutes ago, Morlock said: From the internet.. "Agate is generally a banded material, and observing bands in a specimen of chalcedony is a very good clue that you have an agate. However, some agates do not have obvious bands. These are often translucent agates with plume-shaped, dendritic or mossy inclusions." That seems like a match, thanks man! Quote Share this post Link to post Share on other sites
4meter 169 Posted October 31, 2019 Jake, you are going into the realm of optical mineralogy with that thin slice and tiny minerals. That is far beyond the ability of a forum like this. Your best bet is to take it to a university and hope a grad student is willing to help pay big bucks to a professional mineralogist. Personally, I think calling the sample it Quartz is sufficient. 1 Quote Share this post Link to post Share on other sites
d_day 268 Posted November 1, 2019 It might be an agate, but I think quartzite is more likely. There looks to be a grain tonight, which would rule out agate. 2 Quote Share this post Link to post Share on other sites
fuss 34 Posted November 1, 2019 Yes most likely a quartzite. Quote Share this post Link to post Share on other sites
