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".

Filter by
Sorted by
Tagged with
1
vote
0answers
46 views

Weathering of silicates

I am trying to find a relationship between the silicate-rich rocks weathering products. For example I've found information regarding gabbro weathering in which, according the consulted source, in 100 ...
1
vote
0answers
399 views

What does a negative value for the inclusive graphic standard deviation mean?

I'm calculating the inclusive graphic standard deviation for sediment from a cumulative frequency graph, with this formula: But when I plug in the numbers, I get a negative value, because my ranges ...
1
vote
1answer
129 views

Can anyone identify this gem or stone please? [closed]

Looking to identify, not sure if it’s precious, semi-precious, or just beautiful… Any answers will be helpful.
0
votes
2answers
179 views

Can anyone identify this dark rock that I found near my house? [closed]

I found this black heavy rock near my house, as you can see it has this rounded shape and I can't tell what it is.
0
votes
1answer
293 views

Can someone identify this rock for me? [closed]

Need help identifying this rock I found in river in DR
0
votes
1answer
139 views

Is this a meteorite? [closed]

Is this a possible meteorite? It's very heavy, magnetic, and the the shiny part shows where I sanded it with a file. Seems to be all metal on the inside.
0
votes
3answers
903 views

If rocks are stones, what type of rock are gallstones? [closed]

From Wikipedia: Rock or stone is a natural substance, a solid aggregate of one or more minerals or mineraloids. For example, granite, a common rock, is a combination of the minerals quartz, ...
0
votes
1answer
588 views

The rock that gives birth to quartz sand

Thanks to one minute of the Earth we know that beach sand mother rock, besides the quartz itself, is (or was?) made of olivine, amphibole and orthoclase. I wonder, what is the name of that rock and ...
0
votes
2answers
97 views

Can someone help ID this rock [closed]

Found today in a creek in Indiana, has a geode look and the broken edge shows red opaque facades.
0
votes
1answer
120 views

Identify rock, found in Florida [closed]

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 ...
0
votes
1answer
82 views

What is this stone or mineral it's light but strong [closed]

The other side is just cyan color I don't know where this stone is from Any help is appreciated
0
votes
1answer
451 views

Rock identification: gray with small dark lines/inclusions all over [closed]

Gray stones with short small dark shiny lines all over it. Found it on the beaches of Newport Rhode Island.
0
votes
1answer
105 views

Can anyone help me identify this rock? [closed]

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
2answers
101 views

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

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?
0
votes
1answer
89 views

Identify this transparent brown rock [closed]

t The rocks are pretty small they are dark brown and comoleyelybsee through.
0
votes
1answer
2k views

How long will it take for the ocean to erode Rockall?

Loosely related to the question Will the ocean eventually erode all land?: How long will it take for the ocean to erode Rockall (an uninhabited granite islet within the exclusive economic zone of the ...
0
votes
1answer
63 views

What kind of rock is this?? White rock [closed]

What kind of rock is this?? Found laying on the surface of gravel.
0
votes
1answer
47 views

Rock identification ? What kind of it is? [closed]

My co-worker had this rock and told me found just behind the store, Big R, and put on the table in the office. Location is Trindad, Colorado.
0
votes
1answer
47 views

What is the definition of “ground-up shell”?

The archeologists use the term "ground-up shell" to designate a type of temper used for pottery. What is this material? Earth containing fossilized mollusk shells? I noticed the term is also used in ...
0
votes
1answer
161 views

Rock ID: Bone and potato-shaped, copper-colored [closed]

I found these two intriguing rocks on the UK's seaside. They have an unusual potato shape and copper/green color. Whrn knocked against each other, the sound is clear, metallic and the vibrations keep ...
0
votes
1answer
49 views

Is there any covalent crystals that can be easily synthesized?

I am looking for a kind of crystal that can be artificially made at relatively low temperatures (below 1500 degree Celsius) and relatively quickly (not geological time). The product is ideally ...
0
votes
1answer
112 views

Help me identify my rock is it jade? [closed]

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 ...
0
votes
1answer
127 views

Identification required, rock formation found whilst on holiday in Cephalonia, Greece white object embedded inside? [closed]

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 ...
0
votes
1answer
58 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)
0
votes
1answer
105 views

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 ...
0
votes
2answers
143 views

What type of yellow-green stone is this? [closed]

It's greenish yellow with white. Got it in a mixed stone package from Amazon. No luster, I'd say a 7 in hardness, it doesn't look homogeneous.
0
votes
2answers
72 views

Phase relation for mantle?

I have information about temperature, pressure, normal and shear stresses, viscosity, conductivity, density, heat capacity and adiabatic heating for a particular area of mantle in the form of 2D ...
0
votes
1answer
44 views

If gypsum turns into plaster around 210 F, is there any natural plaster deposits or formations out there?

For a while I have been working with gypsum I mined from a site in Utah, and I realized how low the temperature is to turn it into plaster, so I was wandering; has there ever been any cases of large ...
-1
votes
1answer
55 views

Hi please could someone help identify this rock. Received it as a gift from a friend [closed]

The rock has green,purple and white stripes.
-2
votes
1answer
81 views

Color in Gems and Rocks [duplicate]

Why is it that gems/ rocks, such as Ruby, Sapphire, Topaz, etc... all have their own unique colors? Is this something that happens from chemical attraction with each stone upon formation?
-4
votes
3answers
290 views

Is this a meteor? It's very heavy for its size [closed]

Here it is. Hope this helps you best image I could take.