Questions tagged [minerals]
The minerals tag has no usage guidance.
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Can someone identify these dark red rocks?
It has pretty even color - dark red rock with white snowflakes all over it.
I found it in MA, near lake, where water seems to wash out the shore. The main block was too big to take (but I saw it), so ...
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How do I get a value for jade stone [on hold]
cascading jade stone 50lb piece glows when bright light on it where do I go to get grade value and possibly sale this in Washington state
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1answer
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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 ...
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1answer
37 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 ...
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2answers
107 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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0answers
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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 ...
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2answers
45 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.
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1answer
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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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0answers
45 views
Can anyone help identify this? Or point me in a direction of someone who could
Can anyone help identify? It's crystalline structure is non geometric transparent to light milky (white/purple area) clarity the green color appears gritty and solid like suspended inside the crystal. ...
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1answer
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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 ...
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1answer
58 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 ...
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2answers
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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 ...
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1answer
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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-...
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1answer
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Identify this transparent brown rock
t
The rocks are pretty small they are dark brown and comoleyelybsee through.
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1answer
115 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
42 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 ...
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0answers
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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..
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1answer
75 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, ...
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0answers
63 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). ...
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1answer
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What could this dark brown stone with a white streak found in Romania be?
We found this in Romania, far away from water basins.
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2answers
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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 ...
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1answer
74 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!
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3answers
224 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 ...
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0answers
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I need help identifying this pinkish rock found in Morocco
Found in Morocco, the oriental region, exactly in Oujda, near the Algerian border in the deep woods with another one with the same shape and colors.
Not heavy.
Feels very smooth.
3 colors : White - ...
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0answers
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Alluvial diamonds deposits
What are the minerals that are usually related with the presence of alluvial diamonds deposits.
I need to know which minerals are often used for tracing/tracking the presence of rough diamonds on ...
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1answer
105 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 ...
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1answer
51 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 ...
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2answers
213 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 ...
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1answer
153 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 ...
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0answers
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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?
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1answer
104 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
222 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 ...
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2answers
48 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 ...
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1answer
186 views
What kind of stone is on this photo
Does anybody know what kind of stone this is?
Thanks alot in advance
Wolfgang Adamec
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1answer
104 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 ...
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1answer
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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.
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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 ...
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2answers
58 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?...
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3answers
87 views
Why does Australia have no chrome?
I've been trying to collect resource data about Australia for a few years. Some good reference sites are AustraliaMinerals.gov.au and AustralianMinesAtlas.gov.au
Australia seems to be pretty rich in ...
3
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1answer
77 views
What is this rock I found being sold in a store?
I was recently on vacation in Hawaii and while there, entered a rock and mineral type store where I saw the rock below. I forgot to ask what it was while I was there and I am unable to go back and do ...
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3answers
692 views
Dissolved minerals
I have a question that I am confused about.
If a mineral (say limestone) was added to a groundwater system, say like an aquifer and is completely dissolved in solution, can it ever be a solid again ...
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1answer
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Is there a table with decomposition temperatures of common minerals?
I am about to perform a Loss On Ignition test on a material I know that contains among on things kaolinite, which will release water at 500 $^oC$. However, I tried finding a table with decomposition ...
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0answers
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What is this orange/brown crystalline stone that I found near a mining city in the Philippines?
I found this light colored orange rock with white parts on the road in the Compostela Valley area of the Philippines. The back of this stone has a rough surface and is not shiny. Still, there are ...
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1answer
185 views
Can anyone identify this stone? It was a gift and I can't remember what it is!
Brown tri color stone
Smooth, oblong
Please help identify it if if you can!
4
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2answers
89 views
I don't know what this rock is
I got this rock a year ago at a mineral and fossil event, and there was a stand where they where selling 'mystery packages', boxes full of different fossils and minerals. I bought one, and figured out ...
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1answer
252 views
Why does halite have a cubic crystal
Why does mineral halite has a cubic crystal ? Is this a result of the way by which sodium ions and chloride ions are held together ? And what is the relation between the cubic crystal of halite and ...
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1answer
104 views
Rock ID: Opaque Glassy Gem with Unknown Location
I would like to learn more about this rock that I have come to inherit. It resembles a quartz, and after reading about this mineral I am curious if it is a milky Quartz. Anything you can teach me ...
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2answers
505 views
Please help me identify this stone
I got a stone from my grandfather and wanted to know more about it.
Can anyone please guide me in what this stone is called.
And does it have any value in price
4
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1answer
66 views
What causes this white coloration of the ground in Gilf-Kebir?
It seems, these white blotches are reflective enough that they caused oversaturation of a spot of image taken from a satellite at the L1 lagrangian point (click to open at max resolution, the purple ...
4
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2answers
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Pinkish quartz like. Help identifying and if it is worth anything?
I recently purchased a home, in the fireplace surround that I tore down were several rocks (quartz) that I thought were unique.
I am looking for identification help and if they were worth anything. ...
