Questions tagged [rocks]
Questions about rock types, formation, chemistry, and physics. If you just want help identifying a rock please use the tag "identification-request".
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1answer
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Is this a petrified reptile? [on hold]
River rock from colorado with snake pattern is this a reptile?
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Is there a widely accepted reason for the formation of tafoni?
Expansion of tafoni seems to be based on weathering (seems reasonable enough.) But what creates them in the first place? There are a number of explanations online (Wikipedia lists eight plausible ...
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0answers
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Is it an egg? What type of rock please? [on hold]
This stone was found by my uncle in Western Queensland. It’s light brown in colour and smooth.
It's very heavy for its size. 780 grams.
Pocket knife doesn’t scratch it.
many thanks.
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1answer
42 views
Help me identify my rock is it jade?
Found this rock it looks like a vein of Jade but I have no idea. This is the inside of the rock. I found it already broke the rock is wet in the pic. It's is a hard rough texture and the green in the ...
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37 views
what type of rock is this? blue/green and brown [closed]
I found this rock while up in the mountains and I have no idea what type of rock it is.
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2answers
71 views
Can someone help ID this rock
Found today in a creek in Indiana, has a geode look and the broken edge shows red opaque facades.
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0answers
70 views
Identification required, rock formation found whilst on holiday in Cephalonia, Greece white object embedded inside?
This rock was found in kephalonia Greece, on a beach in lassi. The rock is black in colour, smooth with thumb like prints, very metallic smell and very slightly magnetic. We took this rock to oxford ...
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1answer
486 views
Identification of a rock from Kentucky [closed]
I was hiking the other day in southeastern Kentucky and ran across this rock on a river bank. I've never seen a rock like this before. Can anyone here identify it?
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1answer
44 views
Anyone have any idea what these are? [closed]
Can someone please help me identify these rocks please ](https://i.stack.imgur.com/y28zy.jpg)
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1answer
56 views
Help me to identify this strange rock [closed]
About 9 years ago I found this rock in the middle of the river. It reminds me of a some kind of a volcanic rock, but I live in Finland, and we only have dead volcanoes around here. Outer layer is just ...
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Can anyone help me identify this rock found in Tulsa Oklahoma?
I was working in my front yard in Tulsa Oklahoma and ran over this rock with my lawnmower. It was logged in the ground enough I didn’t see it.
It’s 2.5 inches in length.
Black in color with what ...
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1answer
19 views
Why don't pyroxenites and peridotites appear in Streckeisen's QAPF diagram?
Wikipedia says for QAPF diagrams:
"A QAPF diagram is a double ternary diagram which is used to classify
igneous rocks based on mineralogic composition."
Why don't pyroxenites and peridotites ...
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1answer
109 views
What's the difference between cleavage and fracture?
I see both terms refereing to fractures on crystals or minerals, so I wonder if they could be considered synonymous.
If no, what's the difference between both terms?
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Artifact? Found in US North Carolina close to Morrow Mountain State park [closed]
Scale in inches. I found this in a river. One surface of it (narrow surface) is so flat that I couldn’t quit looking at this find.
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2answers
57 views
Can anyone identify this stone
i found this stone on the east coast of south island in New Zealand, it's 200 grams and very hard,i used a metal file on it and it left steel residue on the stone.
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1answer
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rock id:hard,green,other ones were around but not with black streaks [closed]
Located in vermilion river Lasalle Il. It is a green and has black streaks with what looks like air bubbles at the end.
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1answer
124 views
Can someone please help me identify my rock?
Hey guys! My name is Brent and I found this rock over 20 years ago while swimming with my siblings in Lake Huron near Kincardine, Ontario. I actually found it under water at one of our favourite ...
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1answer
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Identification of limestone type
These are images of a stone found and used extensively in the Jammu & Kashmir region between India and Pakistan. These are called devir or devri in the local parlance.
Following is the ...
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1answer
88 views
Please identify this rock
I found this rock along the Illinois river basin in cave junction, oregon. It was laying on the top layer of a massive beach of rock. It's shape is what drew me too it, then after closer inspection ...
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What is in this rock?
There were many, many examples of this, my photo simply shows a situation where I had even light and time to take a photo without making anyone wait for me.
The basic rock is obviously sandstone. ...
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Identify rock found on beach in Florida [closed]
This rock was found in Florida on the beach on top of the sand. There were no others found. Color of rock is white, the outer rim is clear (see through) the inner layer is solid. The inner layer is ...
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1answer
48 views
Identify rock, found in Florida
Round with crystal looking around it, hard. Seems to have layers in the center.
The inside is smooth and the outside layer is textured. The white layers go all the way through the rock. Found on the ...
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1answer
50 views
What kind of rock is this?? White rock [closed]
What kind of rock is this?? Found laying on the surface of gravel.
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1answer
61 views
Help identify my redbrown rock with crystal like formation on the inside
This rock is red/orange/brown in color.
It is slightly clear/translucent when held up to light.
Will not scratch with a knife.
Has a crystal like structure on the inside.
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1answer
169 views
What is the difference between subvolcanic rocks and plutonic rocks?
I'm studying Plutonic (Intrusive) rocks and i really dont understand the difference between PLutonic Rocks that form in Sills and Dikes from the so called subvolcanic rocks, also known as a ...
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1answer
59 views
Mineral/rock identification [closed]
I found this rock in the Himalayan region in India. It was on the roadside of a hill that we were trekking.
It has a silver lustre. It has a hardness of 5.5(I can scratch it with a knife blade).it has ...
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1answer
130 views
Please Help Identify My Rock
This rock is smooth, heavy and dark grey/black in color with white blotches which are different in shape and size and are also porous. It scratches by a knife and I found it in with many pails of ...
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Rock ID: black, white and orange, from Malaga, Spain
I picked up some very interesting rocks and pebbles on the beach in Malaga, Spain this summer. They are predominately flat and colored dark grey crisscrossed with stripes of orange and white. The dark ...
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44 views
What kind of rock/crystals are these? [closed]
I'm trying to figure out what this rock is.
I've looked all over for a similar crystal formation and I'm coming up with a conclusion it's a type of geode but can't find any with a lot of cavities ...
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1answer
345 views
What is this yellow stone
I found this yellow stone in a creek.It was easy to break by slamming it against another stone and has evenly spaced crystal clear grains.They are very clear that under the sun I thought that water ...
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1answer
45 views
What is this stone or mineral it's light but strong
The other side is just cyan color
I don't know where this stone is from
Any help is appreciated
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1answer
52 views
What is this translucent blue-green oblong crystal?
I think it might be aventurine of some sort, but I'm not sure.
Hardness: It is harder than a steel nail file. The file leaves a track, but it rubs off, leaving no mark. I scraped it on the bottom ...
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3answers
191 views
Making a local geological field trip an interesting and educational event for children?
I have no expertise in geology or earth science, but I would like to do a "field trip" with my home-schooled young children (under age 10) where I could teach them about geology from a hands-on ...
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2answers
108 views
What type of ore is this?
I have found this metal somewhere in a semi-desert area in Ethiopia. The place has no mountains and has no human contact yet. It is magnetic and has some rust on the top which can be removed using ...
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1answer
151 views
Rock identification: gray with small dark lines/inclusions all over
Gray stones with short small dark shiny lines all over it. Found it on the beaches of Newport Rhode Island.
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1answer
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What is this figurine made of: [closed]
Have several of these animal figurines, MADE IN USSR on bottom. Can't figure out what type of rock it is made from. Any ideas?
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2answers
260 views
Could one say that granites are metamorphic rocks, or not at all?
In my old textbooks, granites used to be part of the metamorphic rocks.
Is this still true or not ? If not fully true, to which extent ?
Could someone point me towards clear examples or definitions ...
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1answer
119 views
Identification: mystery rock with golden features and shimmer
I found this rock in our backyard in Germany. As our garden is filled with bushes it was very oddly placed and I have carried this rock around with me ever since, wondering what sort of rock it might ...
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1answer
214 views
Help Identifying this rock with a rainbow
I found this rock and I want to know what it is. It looks like green-grey and when I put one side of the rock on the sun, it changes its colors on that side.
Thanks
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0answers
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What a place that sells rocks is called [closed]
If a nursery sells plants, I'm wondering what a place that sells rocks is called. Something where they offer rocks of various sizes like this:
Well, those are all river rocks, but I'm wondering about ...
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1answer
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I need help with these geode like rocks [closed]
I found these rocks in my pasture and was excited because I thought I had found some geodes. The rocks were in a sandy bank and looked like eggs sticking out of the bank. I am located in Ness County ...
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1answer
92 views
Iron like rock in western pa, is this hematite?
Found this years ago when digging a garden here in western pa, finaly decided to figure out what it is. Its dull, but has thousands of very tiny crystaline specs, very ferus, even the “rocky” looking ...
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2answers
73 views
Can someone help me to i identify this rock found in macedonia [closed]
Can someone help me identify this rock? Also, will it react to acid?
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2answers
231 views
I found this strange spherical stone in Gillette Wyoming. I have no idea what it is. Please help.
These are recent pictures of it. It’s heavy, I see small minerals that catch the light in it, very bumpy, spherical, doesn’t seem to be magnetic, I was falling down a deep trench and kicked it up at ...
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1answer
61 views
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2answers
124 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
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1answer
205 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 ...
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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 ...
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1answer
71 views
What kind of rock or stone is this? Where did it come from?
I found this on the side of the road in Oregon, i think it was left or forgoten about thats why it was left there but it has crystal pockets, multiple colors, some smooth sides, perfect circles and ...
