Search the Community
Showing results for tags 'mica'.
Found 9 results
-
Found these 4 rocks near bedrock in same area of my other finds. Near forest, former farm land, streams and game trails. Still have a huge pile to dig through. Will take some time to finish the work. Have shiny elements and mica. Take you for your opinions.
-
This is another rock from the batch discarded by a college geology department and "rescued" by my daughter in law. I am pretty sure the shiny bits are mica - muscovite? Are they in calcite? The mica will flake and the matrix will easily fall apart, but it does not fizz in industrial strength vinegar. Will not scratch glass, appx 5 cm in length. Some of the reflective bits looked red through a magnifying glass, but that color did not come through in the photos. Origin unknown. Thanks!
-
If this topic was posted in the wrong place feel free to pull out the whips and chains. These are being found at deposit of petrified wood in south Alabama. Silicification strata sure looks favorable in situ-clay, then 1 foot of wet sand and rounded quartzite, then the wood. No limb nots, most of it has straight parallel bands like a vascular plant. Occasionally some samples with annual rings. Complete logs are rare, most are segments from 5 to 50 pounds. It seems related to Tallahatta silicified sand(stone). And it seems to have silicified grey sand in it. Thanks in advance.
- 3 replies
-
- 1
-
-
- fossilization
- mica
- (and 5 more)
-
Hey! Sooooo I’m usually really good with identification of most minerals but this one to me is just weird. I’m thinking it’s a type of mica, maybe even schist but it seems to have little circular petal like formation. Maybe it’s an atypical formation or presentation? Either way it’s pretty neat piece
-
Hello, In correspondence with a local geologist, he mentioned a Mica layer that is found in a particular strata locally. The same layer is evident in what seems like 30-40 miles of distance between locations. He said if it could ever get tested and determined as an ashfall, then a very accurate date could be obtained. The question is, are there any testing facilities in the United States for this sort of thing?
- 1 reply
-
- 1
-
-
- ashfall
- geologic age
- (and 2 more)
-
Hi there, I found this specimen on a hike outside of Denver, Colorado. It was laying in the middle of the trail. It’s about 10cm long. It has grain that looks like wood or layers like mica. It’s also gold and shiny like pyrite or mica. It’s layers are wavy and it leaves a gold dust behind when handled. It’s stunning when the light hits it. Hoping to identify what it is. Thank you! Lisa
-
hi, can you please help... I thought this was pegmatite but not so sure. It broke easily and once cracked I was able to break chunks off by hand it has mica, crystals they look purplish or grey i also think black...thanks in advance
-
Found wandering the bluffs of Copenhagen Community in Northeast Louisiana. Any help appreciated.
-
Hey everyone! New to the community and glad to be here...haven't quite written my hello yet, but couldn't wait to post either. I have this little unique specimen found in Llano County, TX in the hill country and while I've identified the makeup of the specimen, I haven't put a name to it yet, although I'm leaning toward beta spodumene (lithium) ore. I'd like to get everyone's input. The vast majority of the rock is feldspar with the black parts being roughly 90% biotite mica and 10% hornfels. At first I thought some type of granite until looking under scope at the formation of the feldspar. They're monoclinic vertical striations and crystalline in nature. Here is the photo, the best I could get without my scope: Thanks in advance and glad to be a part of The Fossil Forum! Brance
