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
Join us in building a kind, collaborative learning community via our updated Code of Conduct.

For help in identifying objects such as rocks, minerals, clouds, ... Please follow this guide when asking for rock identification: http://meta.earthscience.stackexchange.com/a/125/56.

0
votes
0answers
16 views

Need help identifying this rock

I need a little help identifying this rock. It was found somewhere in the Sahara Desert. It is very hard and leaves a beige streak on a steel file (might be the concretized dirt covering it). The ...
0
votes
1answer
29 views

Rock/mineral identification - smooth black inside

It’s yellow and grey on the outside but smooth and black on the inside. Very roughly 2.27 g/ml Just curious, it almost like sea glass on the inside but it’s far too dense.
1
vote
1answer
20 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
49 views

Hi, I'm hoping to identify this rock.

Would anyone be able to identify this rock?
0
votes
0answers
29 views

Another mineral inside this Rainbow moonstone?

I got this rainbow moonstone from Jaipur, India. The front and back are polished, has black tourmaline around it’s edges, and is 25x28mm. I didn’t notice it when I bought it but It seems to have ...
0
votes
0answers
26 views

Help with identification

I'd appreciate it if someone knows something about this rocks. This is new for me so I'm like a child :) but they are so beautiful. From Bosnia, place was cemetery in WW II. Thanks
0
votes
0answers
27 views

Can anyone help me figure out what kind of rock this is?

I was cleaning out my basement and I found this wrapped in a cloth inside a tin case. Does this rock hold value? What is the geological history of it? I'd really appreciate insight on this.
0
votes
0answers
22 views

What type of lightweight “stone” is this?

This is lightweight compared to almost any other stone I've held. I found it in Michigan, in sandy soil about 24" deep. Broken side:
0
votes
1answer
36 views

Could you help me identify these rocks please

Found these whilst walking around Warwickshire please could you help.thanks
0
votes
1answer
34 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 ...
0
votes
2answers
34 views

I believe we got this rock in the mountains of Creede Colorado

Solid, has some weight to it, looks like it possibly has some purple amethyst on the opposite side, but mostly consists of this silver: Can anyone identify it as silver?
6
votes
1answer
61 views

What is the oldest fossil on Earth?

What is the oldest fossil ever found on Earth? Where and when was it found? What was the oldest fossil with a brain with 2 hemispheres ever found?
0
votes
0answers
23 views

What is the name of the rock and the minerals it contains?

This rock was given to me for mineral identification during my Economic Geology Class.Now , I have managed to spot some of the minerals here , but I am not too confident with my answers. The lab ...
0
votes
0answers
39 views

Is this an Agate? What kind? Or what kind of rock is it if not Agate?

It think is an Agate but not sure what kind of it is. As best as I can tell under the orange its really pretty. It is 21 lb. I found it at a rest stop out side of Yakima, WA, USA. But it does not ...
3
votes
2answers
42 views

Anyone tell me anything about this rock and crystals are please

Rock is fairly crumbly but takes force to break bits off. Found along the river Severn at Portishead battery point in the uk. One side looks like could be fossils and the other side interesting ...
0
votes
2answers
49 views

Is this a fossil

It this a stromatolite fossil? If it is, it’s probabaly at least 1 billion years old
1
vote
0answers
37 views

What is the fastest we ever traveled under water on Earth? [closed]

What is the fastest we have traveled under water manned or unmanned? I tried to find info on this but it seams wiki is not pulling this up very good nor Guinness.
0
votes
2answers
44 views

Rock Identification (West of Scotland)

Could anyone please identify this rock found off the West coast of Scotland?
9
votes
1answer
64 views

Is this a former volcano?

On my random explorations of google maps, I came across this interesting terrain: (link to map here) Apparently, this is part of the so-called Hamad Plateau, in the Syrian desert. If so, the rock ...
4
votes
1answer
38 views

Unidentified mineral found in France

(I am not a native english speaker, so I'm not really aware of the specific terminology.) A few years back, I found an unidentified rock on a beach in Normandie (France). It looks and feels (texture-...
1
vote
0answers
60 views

What kind of gem is this

I had got this as a kid and I am wondering if it is worth anything.
0
votes
1answer
50 views

Identify this transparent brown rock

t The rocks are pretty small they are dark brown and comoleyelybsee through.
1
vote
1answer
104 views

Identify my black piece of stone/fossil?

I found this piece at [Battery-point, Portishead, UK][1], at a site for fossil hunting. It is smooth one side and porous on the other. It also has one side with beautiful colours shining on the ...
0
votes
1answer
65 views

Pink Rock Identification

I found this in the parking lot during a craft fair. Does anyone know what it is? I’m thinking it’s either pink kyanite or pink tourmaline, but I'm a amateur so I can’t differentiate between the two. ...
5
votes
1answer
117 views

Basalt, slag or meteorite?

I found this rock on the edges of a known Drumlin in North East England. It looks to be a fragment from a larger piece. It attracts a magnet strongly, it weighs 150 grams. It has vesicular holes (on ...
0
votes
1answer
55 views

Does anyone know what this black rock is?

I have found several grey rocks like this one on a beach along the ocean and I don’t know what they are. This is the only black one I’ve ever seen. Anyone know what it is?
0
votes
0answers
19 views

Identification of rock samples

These samples were found unlabelled in a museum shelf. Could someone help me identify them? https://imgur.com/a/LQ4qZ1T
2
votes
1answer
67 views

What's this mineral?

I'm 99% sure I got it in California on base while walking near the airstrip so it could have come from litterly anywhere. I can't seem to break any pieces off. It's kinda heavy for its size and hard. ...
0
votes
0answers
48 views

What would cause a rock to fracture to a central point?

I found a rock that appears to be a fragment of a fairly spherical rock. The original outer surface is knobby, while the broken side has ridges radiating from a central point. (See photos.) What ...
0
votes
1answer
53 views

Identification of rocks

My mother found a lot of unlabeled rocks samples in a museum shelf and has to label them. Unfortunately, both of us know nothing about rocks. Could someone help us in identifying these samples? https:...
0
votes
1answer
77 views

What on Earth in can repel a magnet? [closed]

The iron in blood is naturally repelled by a solid magnet the opposite of iron outside of blood by a magnetic field and I wander... Are there any elements that are repelled by a solid magnet? https://...
2
votes
1answer
86 views

Please help me identify this stone (Look like some kind of quartz, but I'm not sure.)

My young sister found this stone on a street and she asked me what type it is. And I really don't know. It was found in Western Ukraine, in North Galicia. But it may be that it was brought here from ...
4
votes
0answers
37 views

Identification: Greenish Greek stone

Volume: 100ml +- 2% (yes, I couldn’t believe it either); Mass: measurement pending, but above 200g I just bought a mineral identification book and it says to take a streak. I tried with tiles at home,...
2
votes
1answer
52 views

Can anyone tell me what’s inside this rock please

I got this rock yesterday from a friend who was unsure of what it was. I think it’s carnelian but what’s interesting I what’s inside!! Any ideas what it is?
10
votes
2answers
93 views

Strange scar marks on pebble

My question is not specifically about identification of this piece of rock. Instead I am focusing on the origin of the scar marks on this rock. I have found this stone in the pebbles in the path. This ...
1
vote
0answers
33 views

Metallic rock identification from Ontario Canada

This rock was found in Lake/Lac Clair near Sturgeon Falls Ontario Canada in about 2 feet of water next to the edge of the lake. It can easily fit in my hand. You can see a size comparison in the ...
0
votes
0answers
41 views

Gem identification

I received a bunch of stones from my Grandfathers mineral collection but i’m unable to identify some myself. I’m not certain if this stone is a rose quartz. It’s about an inch long and has some kind ...
0
votes
0answers
23 views

Caspian Sea oil deposits

Azerbaijan appears to have vast development in its oil sector. Images on google earth show oil platforms connected by road ways far out into the Caspian Sea of the coast of Baku. Why is the majority ...
1
vote
1answer
59 views

Dark heavy rock

I found this dark heavy rock near Wombeyan Caves NSW. Australia. It is 9 by 6 cm and weighs 353g; it is not magnetic and was found in a dried up riverbed.
2
votes
1answer
106 views

Are these obsidian snowflakes?

I'm not sure if these are obsidian snowflakes: I found it near a river, hardness is 4 to 5, it has a wax lustre when pre-polished. The 'flakes' in the matrix are raised and gray. Pre-polished side ...
4
votes
1answer
73 views

Can someone identify this geode found in upstate NY

Can some identify this geode? It was found in upstate New York in a flat sandy plain 1/4 away from the Hudson River. The geode is approximately 3" long, brown exterior, 1/4" "shell" gray , and 1 1/2" ...
11
votes
2answers
930 views

What causes these mound-like ground formations?

Whilst riding on Mam Tor in Castleton, England I came across this scene (not my photo) and I would like to know what causes the formations which I have ringed in red. They look like piles of earth ...
5
votes
0answers
45 views

Rock ID: brown, magnetic inclusion in Carpathian amethyst geode

What I believe is an amethyst geode (roughly 6" = 15.24 cm across) from somewhere in the Carpathian Mountains contains an oval-shaped inclusion of material with what look like pits of green ...
0
votes
1answer
52 views

What kind of stone is this?

Years ago, I bought from a flea market two strange looking stones, that the owner said he had found under the sand of a dune in the desert (I don’t remember which). Maybe it’s true, maybe not, but I ...
2
votes
2answers
64 views

Need help to ID rock type

I found this rock in a freshly ploughed field, and it looked too unusual to pass up. Can anyone identify what it is?
3
votes
1answer
89 views

What's this? Chess pieces growing spines!

These chess pieces have laid undisturbed for a long time (15-20 years?). In this time, they seem to have grown clear/white, spiny, long crystals. I'm wondering if they are dangerous, but also curious ...
1
vote
0answers
35 views

What kind of round grey rock is this? Is it a fossil of some sort?

Help me identify this rock please and thank you
2
votes
1answer
91 views

Is this deep green calcite, green gneiss stone?

The site where it is found is characterized by schist, quartz and gneis, but also other species of rock. This is a scissors 2 cm semi transparent, vitreous luster, hard scale 6.5 - 7 ... I will post ...
0
votes
1answer
72 views

What is the type of stone/mineral in this necklace please?

I would like to sell this necklace but can't remember its original description and the online store where I got it no longer carries it so I can't look it up that way. Blue Chalcedony comes to mind, ...
1
vote
0answers
47 views

Can someone help me to identify this rock/mineral?

This is a small piece of a bigger chunk (about 9kgs). Someone told me it might be meteorite since its heavy for its size and has shiny particles. Others told me it might me an iron ore (magnetite). ...