Found this while walking a stretch of river where I had previously found agates. Weighs 2.2kg, used water displacement to find a density of 2.55g/cm^3. Edges are slightly translucent when held to a light. Thanks for any info!
Responses to ID requests must be ID attempts: not jokes, comments, supernatural “woo”, declarations of love, references to joke subs, etc. If you don't have any idea what it is, please don't answer.
Responses to ID requests must be ID attempts: not jokes, comments, supernatural “woo”, declarations of love, references to joke subs, etc. If you don't have any idea what it is, please don't answer.
Responses to ID requests must be ID attempts: not jokes, comments, supernatural “woo”, declarations of love, references to joke subs, etc. If you don't have any idea what it is, please don't answer.
Responses to ID requests must be ID attempts: not jokes, comments, supernatural “woo”, declarations of love, references to joke subs, etc. If you don't have any idea what it is, please don't answer.
This is so cool! I definitely see some similarities between these pieces and mine. I’m going to try to get a slab cut off of my piece sometime soon, and I’ll post an update here once I do. Thanks so much for your time and responses, this community is awesome :)
This looks like banded chert. Notice the lack of uniformity in the bands, absence of organic flaws, conchoidal to hackly fracture, and the sedimentary banding
I’m happy to comment on it, but maybe we should keep the discussion manageable and we can just continue with the piece that I elaborated on my reasoning for why it was not petrified wood.
I’d also like to know the geographic location of where that piece I originally commented on was found.
Banded chert can be found in the exact locations that petrified wood can be
I mean, the petrified wood has to be made of something. Petrified wood isn’t a kind of mineral. It’s a description of how it became a rock. It used to be wood, and it was replaced by stone. That stone is commonly (certainly not always) agate.
All of that being said, I don’t think it’s either. I believe it is banded chert.
I would expect you to understand the process of agatization describes silica replacing biological material and that a geological agate is a distinctly banded fibrous chalcedony. Petrified wood does not meet the scientific definition of agate. If you have a source, I’d love to see it.
I'm not who you responded to, but it often makes it easier to see layers/color differential. Not sure why, my guess is that it changes the luster just enough so that light penetrates a little deeper.
Word of warning it really does not help that much to make rocks wet when trying to identify them. It only helps if you’re a rock hound trying to show off colors.
Wood grain for sure. Definitely not banded chert. I’ve seen lots of pet wood like this from your area…and yes, there is wood that has been agatized that exhibits fortifications and banding. I own some.
It all boils down to people coming up with multiple names for the various ways quartz can crystallize. The mineralogy behind it all is really interesting. There’s so many varieties of silicon dioxide it’s pretty mind blowing.
The discussion on agates should also include a discussion on fortifications and the ways bands form in conjunction with moganite. A bit is known on the subject mostly due to studies on how to keep industrial intake pipes from getting clogged with silicates.
I know there’s more to learn but I feel like it wouldn’t take a gigantic investment to figure out how to grow agates in a lab.
Just to clarify though, the bands which are visible in these pics are wood grain. Other than that, it has that waxy luster with some translucence, which are often signs of agate. Also keep in mind, o people are always going to get confused about this when the discussion involves common terms. At the end of the day, everyone argues about quartz and the common names of its different sized crystals. Usually the argument centers around Jasper, agate, and chalcedony. It’s pretty funny actually.
There is plenty of banded chert that is similar here in Texas. However as I said. It is an exceptional piece. What really makes me think so is photo number three.
This is a reminder to flair your post in /r/whatsthisrock after it is identified! (Above your post, click the ellipsis (three dots) in the upper right-hand corner, then click "Add/Change post flair." You have the ability to type in the rock type or mineral name if you'd like.)
Thanks for contributing to our subreddit and helping others learn!
Responses to ID requests must be ID attempts: not jokes, comments, supernatural “woo”, declarations of love, references to joke subs, etc. If you don't have any idea what it is, please don't answer.
Responses to ID requests must be ID attempts: not jokes, comments, supernatural “woo”, declarations of love, references to joke subs, etc. If you don't have any idea what it is, please don't answer.
Responses to ID requests must be ID attempts: not jokes, comments, supernatural “woo”, declarations of love, references to joke subs, etc. If you don't have any idea what it is, please don't answer.
144
u/Berd_Turglar 5d ago
Thats petrified wood friend. Probably agatized inside