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Questions tagged [minerals]

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0
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1answer
19 views

Is this a petrified reptile?

River rock from colorado with snake pattern is this a reptile?
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0answers
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.
0
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2answers
65 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.
0
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2answers
42 views

Can anyone help me identify this type of translucent green mineral? [closed]

This is the photo of the rock. I found it in the mountains in yemen, near rocks where a well was dug out. Its translucent green and It doesn't feel that heavy. I think it's some type of quartz.
5
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2answers
65 views

Rock Identification: clear, hues of yellow/orange. Washington State

I purchased this rock at an estate sale along with some rose quartz. The sellers had no information on it. My husband was able to break it today with a hammer, but I have no idea what the material is. ...
3
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1answer
106 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?
1
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0answers
11 views

Why do allophane soils behave as gels?

It is notoriously difficult to determine the texture of soil containing allophane and immogolite. According to the literature this is because the clay fraction "behaves as a gel", i.e. it's not ...
2
votes
1answer
43 views

An oblique-square-prism crystal?

Does any mineral crystallize in the shape of an oblique square prism? If so, what crystal system (monoclinic, cubic, hexagonal, etc.) would such a mineral fall under?
1
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2answers
168 views

How are minerals classified?

What exactly is done to classify minerals in Earth Sciences such as Geology? How can it be known if one mineral is the same as another if they should be visually different?
2
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1answer
96 views

How salty can snow/sleet be?

Can enough salt particulates be in the air to create salty snow or ice that is undrinkable? Will ice form in sub zero temperatures through condensation in salty air?
1
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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 ...
1
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0answers
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 ...
1
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1answer
46 views

What is cluster situation with respect to sand mining?

Guideline on handling cluster issues : The original Environmental Impact Assessment ( EIA ) notification does not provide for the procedure to handle cluster situation, which has been proposed in ...
3
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1answer
48 views

Preservation of clay items

I have a general question which may sound naive: archeologists eg in Ancient Greece take a lot of information from preserved pottery they found. What physical attributes of ceramic items made of clay ...
1
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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 ...
2
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1answer
39 views

Where to start searching to find more radioactive minerals?

I'm pretty new to all this... I've recently purchased a Geiger counter, and am hoping to locate rocks like pitchblende and other radioactive minerals for my collection. I'm based in the North West ...
0
votes
1answer
75 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 ...
3
votes
2answers
230 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 ...
1
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0answers
59 views

Help Identifying this Mineral? [closed]

I have the following rock/mineral but can't seem to identify. Anybody have an idea what it might be? It's heavy, 3"x3", nonmagnetic (but slightly repels a neodymium magnet), blackish in color with ...
1
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2answers
121 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
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2answers
64 views

What is this stratefied limestone sphere?

What is this stone from the alps of provence? It's two spheres, one of them is made of at least 25 layers.
3
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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 ...
5
votes
1answer
192 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 ...
3
votes
1answer
111 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
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2answers
152 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 ...
4
votes
1answer
62 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-...
0
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1answer
73 views

Identify this transparent brown rock

t The rocks are pretty small they are dark brown and comoleyelybsee through.
2
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1answer
228 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 ...
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0answers
48 views

Identifying rocks, minerals

I am sorry to bother you.. before passing away, my grandfather gave me a special box that contained all types of beautiful, colorful rocks and minerals. I am having a hard time identifying them! Could ...
1
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0answers
54 views

Please help me with the identification of this rock

What is it? It has what looks like white glitter its ugly dark brown and some orange heavy..
0
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1answer
85 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
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0answers
109 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). ...
0
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1answer
80 views

What could this dark brown stone with a white streak found in Romania be?

We found this in Romania, far away from water basins.
2
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2answers
777 views

Melting point of minerals

Looking at this website, I can see the melting point of the following minerals: http://hyperphysics.phy-astr.gsu.edu/hbase/Geophys/meltrock.html Apparently at a temperature of 1200 °C, all the ...
5
votes
1answer
305 views

Why is streak different from color?

Many minerals have a streak that's surprisingly different from it's outward color. Why is this? What causes the optical properties to change if the mineral is powdered? Thanks!
3
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3answers
529 views

Help! Can anyone identify this deep blue rock, quartz, crystal thing from Washington?

I was like 10 waiting for my dad to get off work. He was a surveyor and brought this blue rock thing with him for me when he got off. He said they were surveying and his friend took a pickax to a rock ...
5
votes
1answer
141 views

What are the cubic formations found inside Larimar gemstones?

I recently noticed what appears to be common cubic formations just beneath the surface of Pectolite (Larimar) gemstones. They quite resemble transparent sugar sprinkles. Each formation isn't perfectly ...
5
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1answer
153 views

Difference between pyrite oxidation and dissolution

I've seen papers use oxidation and dissolution of pyrite. Are these two processes the same? I was always under the impression that pyrite does not dissolve easily. What is the difference between ...
5
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2answers
297 views

What is this complex reddish-brown stone with lighter spots found at a NZ beach?

I found this small stone on a beach on the east cost of the North Island in New Zealand. It's red/brown and has almost gray spots, but also has lots of white crystals coming out of it. It has a dull ...
1
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1answer
277 views

Help me identify these New Zealand rocks

I found these 2 at the beach on the east coast of the North Island in New Zealand. The white one is beautiful, it sparkles and glimmers and even the brown/pink veins through it sparkle, but it's ...
1
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0answers
43 views

Pyrite oxidation

How much pyrite has to be oxidized to produce a sulfate concentration of 15 mM? If the solution initially has a pH of 8, roughly what would the pH drop to if there is no buffering of acidity?
3
votes
1answer
129 views

Is this quartz crystal or something else?

I found this stone on the way. It looks as same as in the attached photo. Some say it's quartz crystal and some say it's something else. Can anyone help me out?
4
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1answer
382 views

Saturation Index clarification

I have a problem with my project and I was hoping I would find some clarification. I did some modeling with phreeqc to calculate saturation indices and found that calcite was saturated in an ...
5
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2answers
61 views

Sulfate salts of magnesium and sodium

What concentrations of magnesium, sodium and sulfate are needed to precipitate solid MgSO4 and Na2SO4 (let's say evaporation is occurring in a system) I'm assuming probably really high because they ...
0
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1answer
199 views

What kind of stone is on this photo

Does anybody know what kind of stone this is? Thanks alot in advance Wolfgang Adamec
0
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1answer
127 views

Mineral Identification

I have a green, moderately magnetic, rock with yellow inclusions. The rock is very heavy for its size. What is the most likely minerals in such a rock? Update: Found on the Maine coast. Rock has been ...
-1
votes
1answer
77 views

Satellites minerals finding capability

Just wondering with the latest satellites currently available, is it possible to locate gold which is buried under 200 ft? what is the maximum depth that satellites can look for such minerals.
4
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0answers
114 views

Dolomite and calcite precipitation

In an engineered wetland, there is groundwater flow from an aquifer with a chemical composition that is rich in magnesium, calcium and sulfate. We are finding that the aquifer is consistently ...
1
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2answers
76 views

Limitations on mineral precipitation from solution

If the solubility constant for a mineral is exceeded and, thermodynamically, a mineral is favored to precipitate in solution, are there any factors that may limit this from happening? Perhaps kinetics?...