Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [geology]

The science comprising the study of the rocks Earth is composed of, and the processes by which they change. Some subfields of geology are petrology, mineralogy, and geophysics.

1
vote
1answer
16 views

What kind of purple stone is this?

I found this stone and I do not know what type of stone is this?
0
votes
0answers
28 views
-2
votes
0answers
21 views

What are these purplish-brown and white rocks? [on hold]

I found these rocks along the train tracks in Monroe, Wisconsin. I mostly only took the ones with lots of white in them, but most didn't have that. I'm not sure what these rocks would be called. (...
1
vote
1answer
30 views

Is this Mutton Fat Jade?

Found this near the Shannon River close to Carrick on Shannon Irelandenter image description here Could this be Mutton Fat Nephrite Jade? Thank you
1
vote
1answer
22 views

What is this rock found in the Illinois Valley of Southern Oregon?

I found this odd shaped rock along a rocky river bed (dry) near the Illinois river in Cave Junction, Oregon. It is shaped like a Club and is super heavy. It has a distinguishable ring around the ...
1
vote
1answer
37 views

Please identify- no origin known but given to me by a geologist

A very dear man who love his job as a geologist gave this to me. He’s been all over the country so I have no idea where he may have picked it up
0
votes
1answer
39 views

Please help identify

I have had this rock in my yard for close to 10 years. It was left behind by the previous tenant. Can you help identify it? It has layers, a mixture of soft and hard, and is tan to white in color. ...
3
votes
1answer
70 views

heavy, brown, rock with crystals, please help identify

please help identify this rock. it is heavier than most. dark brown color. picture is shown with streak test. found in Philadelphia pa. at home demolition site. crystals seem to be different type and ...
1
vote
0answers
36 views

Rock identification - origin unknown

I'm trying to identify this rock. It's fairly fine-grained and has a green tint. It's fairly heavy for its size, I cannot scratch it with a figernail but I can make a scratch with a knife. The rock is ...
1
vote
0answers
42 views

What types of stone are these rocks I found in Scotland

Please could someone tell me what type of stone this is I came across it while walking my dog. I'm in the highlands of Scotland!
1
vote
0answers
43 views

python generate 3d unstructured grid

I would like to create a 3d unstructured grid based on data points with xyz and property. Can Python do this and what tools? My question is quite generic but i can provide more details: the data has ...
0
votes
0answers
47 views

What gold colored rocks are these?

I found these golden coloured rocks while digging on a construction site in Surrey. Can someone help me identify what they actually are?
9
votes
1answer
71 views

Rocks sparking under water

I have searched for an answer to this question for years, to verify if it was true. A man that lived on a river in the rugged part of the northern Washington Cascades told me an interesting story. He ...
6
votes
1answer
58 views

Historically, how did the total amount of salt / NaCl on Earth develop?

After reading this question about the origin of NaCl on Earth, I'm wondering: How did the amount of NaCl develop historically? Is it a more or less linear growth until today? Was it such a linear ...
4
votes
0answers
15 views

How do I generate a Moho depth model from seismic refraction data?

There are several permanent seismograph stations in Eastern Canada that have been recording arrival times for over 25 years. Using refracted Pn arrival times from natural earthquakes I would like to ...
4
votes
2answers
86 views

How do the different densities of the oceanic and continental crust affect earth's outer shape?

I am currently reading a textbook and I am slightly confused at a paragraph that deals with some general facts about earth's outer shape. It mentions that the density of the continental crust is ...
0
votes
1answer
114 views

Is astrochronology a proper method?

Wikipedia's definition of astrochronology is: "Astrochronology is the dating of sedimentary units by calibration with astronomically tuned timescales, such as Milankovic cycles,1[2] or even ...
6
votes
2answers
89 views

What caused this waterfall to have rounded formations?

This is at Bua Tong Waterfalls in Chiang Mai, Thailand. Tried to find scientific information about this waterfall, but google turns up only travellers' vague guesses, suggesting calcium carbonate ...
1
vote
0answers
49 views

What are the name of these stones?

There are some kind of stone, I collected them and I want to be sure of their identification.
2
votes
1answer
270 views

Please identify this pink transparent stone?

Pink transparent stone it maybe obsidian but my research indicates pink colour is very unusual for obsidian It’s translucent, all pink, slightly refractive you can read letters through when stone is ...
0
votes
0answers
29 views

Peculiar Piece of Petrified wood? Or just another piece

Multiple years ago I found a chunk of petrified wood in my grandmothers yard in Northern Utah, what is unique about it is you can see the transition from rock to wood. But the wood feels like wood, ...
3
votes
2answers
90 views

Please help identify this! Rock? Glass? Crystal? It's big and very heavy

About 1.5 feet tall, 1 foot deep and 2 foot wide. Very heavy and very hard. I will get a better picture posted asap. You can read a newspaper thru it. Was left to me by my uncle years ago but never ...
0
votes
1answer
49 views

I need help to identify this rock

I would like help to identify this Stone. I found this stone in my back yard. I would just like to know if it is worth anything or if I'm just going to add it to the driveway.
4
votes
2answers
49 views

Subrelluric forces in a volcanic eruption

I am listening to a song about volcanoes. It is called "Pyroclastic Annihilation" performed by a brutal deth/thrash metal band called "Demolition Hammer". It is from their album "Epidemic of Violence" ...
3
votes
2answers
72 views

What is this? A sinkhole?

Lat., long.38.47491, 43.48882, in the vicinity of Van in Turkey I saw this when hiking. I want to know what it is and what are the dangers it poses. Lots of people hike that area in spring and summer,...
8
votes
1answer
81 views

Seeming correlation between time of day and earthquakes

I live in a generally geographically active area (Southern California, near the San Andreas fault, if that matters), that has had two relatively minor earthquakes that I have felt in the last week (in ...
0
votes
1answer
49 views

Can anyone help me identify this rock?

This is probably just something really common and boring to most people, but I was intrigued so I thought I might as well ask now I can. When I was in Portugal (I don’t know specifically where we were)...
0
votes
0answers
35 views

I was wondering if this could be coprolite

I found this in what looked like to be a dried up creek bed in a forest in idaho
1
vote
0answers
34 views

Rock ID: Dark, Hard, Midland Valley Scotland

Found this in a river. The dark part is the rock still drying out. I think the smoothness is the weathering from the river. The rock is heavy and a little bit rough on the underside among the ...
0
votes
1answer
35 views

The magnetite is in which type of magma

In which type of magma can I find magnetite? Peraluminous or peralkaline? I've been looking and the peraluminous magma have a lot of oxides so I thought it would be reduced magma so it would have ...
3
votes
0answers
37 views

How does palingenetic fusion occur in rock?

As far as charnockites are concerned, granitic charnockites are formed due to palingenetic fusion and metasomatism, while granulitic charnockites are formed due to high grade metamorphism. When I ...
1
vote
3answers
101 views

Can anyone help me identify these rocks please?

I apologize for any errors in my pictures or writing. My first post. [
2
votes
0answers
53 views

Whats this stone?

Found it couple days ago and it amazes me how smooth the surface is but cant identify it please help me. Found it in north germany near a lake on a trip there.
1
vote
0answers
40 views

Can you help me identify my rock?

I found this rock in my yard. Can someone please identify it for me? I’m not sure if you can see the blue hue on the rock in the picture! (https://i.stack.imgur.com/cuklH.jpg)
2
votes
2answers
92 views

Is this very old glass or a type of crystal?

I found these in Spain buried within a very old rocky sea bed along with many fossils, would this just be peices of damaged old glass or is it some form of crystal/rock? Thank you in advance
1
vote
1answer
48 views

Please help me identify the inside of this stone

please could you help me identify this stone I found on the beach, it almost looks like it has tiny eggs inside but they definitely aren’t as they are solid and aren’t removable Thank you in advance
0
votes
0answers
17 views

How do I Interpreted EDX Result?

I am new for SEM-EDX but I want to learn. In the EDX data result, there are Wt % and at % from every element (for Example if : Wt % C 14.16, O 51.22, Al 2.22, Si 30.64, Fe 1.75 and At% C 21.11, O 57....
5
votes
1answer
42 views

What is meant by Massif?

In India, Panchchuli, Kun Nun and Shilong only these mountain are claimed to be massif. Why other mountain formations are not termed as massif...? What are the characteristics of massif..? Anybody ...
0
votes
1answer
55 views

What kind of rock is this? It was inside a bigger rock

I found this when I was really little, and I'm 18 now. It was inside a bigger rock; the three pieces fit together to make one piece. The biggest piece seems to have some kind of fossil on it. I've ...
0
votes
0answers
22 views

Could unconformities be a tool for preparing a geological timescale?

Unconformities subdivide different strata of rock. However such a thing could only bear the temporary scenario of the depositional beds. Then how far it could be useful to build a whole geological ...
0
votes
1answer
47 views

If the earth were completely smooth and covered in water, what would occur with ocean waves?

Related to this post: If the Earth were a smooth spheroid, how deep would the ocean be?
3
votes
1answer
43 views

Mineral identification; black & metallic

During a recent trip to the Portuguese island of Madeira, I found a couple of interesting rocks on a beach. Both the rocks pictured in this question contain the same black mineral. I first guessed ...
0
votes
2answers
91 views

Help me figure out what this purple rock is

I found this in the ground at a job site in blue springs mo . Its purple with darker purple lines through it like growth marks on a tree. It is about the size of a large loaf of bread 7 inches across ...
1
vote
1answer
37 views

Can someone help me identify this crystal

So the actual rock looks black but I put it up to the light n I see green n black.... can you help me figure out what it is ? my grandfather gave it to me years ago n I’d like to find out more about ...
4
votes
1answer
155 views

Why do some earthquakes and volcanoes occur within plates?

I know that volcanoes and earthquakes occur on plate margins. But, do some of them also occur within plates?
5
votes
3answers
80 views

Why are the mountains predominately grey or dark brown?

Observing many photos of mountains one can assume that most of the mountains are grey or brown. See also the mountain article at Wikipedia. There are however several ways a mountain can form, which ...
5
votes
2answers
58 views

Is it possible to create clouds by pumping water into volcanoes?

Suddenly, there is this idea in my mind that if an important effect of global warming is rainfall reduction and drought, is it possible to use volcanoes as water vaporizers (regardless of costs)?
0
votes
1answer
46 views

What is this heavy rock having gold-olive colour and tiny gold coloured crystals?

The rock is very heavy, about 1.2 kg and 5 inches (~ 13 cm) long, gold–olive colour. The back has tiny gold coloured crystals and the front has bigger ones as seen in the picture. I don't really know ...
3
votes
2answers
33 views

What can one come to know about a mineral just by knowing name

I have been busy learning the components of various minerals for upcoming test....is there any way to predict the components or properties of a mineral just by knowing it's name? Eg: albite,augite, ...
0
votes
2answers
57 views

Is this a fossil

It this a stromatolite fossil? If it is, it’s probabaly at least 1 billion years old