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Questions tagged [minerals]

For questions about minerals, i.e. naturally occurring crystalline chemical compounds. Also consider [metallurgy].

13 questions with no upvoted or accepted answers
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7
votes
1answer
193 views

Use of cryolite and fluorspar in electrolytic reduction of pure alumina by Hall-Héroult process

Cryolite $\ce{(Na3AlF6)}$ and fluorspar $\ce{(CaF2)}$ are added to alumina to lower the temperature of the mixture from $\pu{2000 °C}$ to about $\pu{900 °C}$ and also to increase the conductance. But ...
7
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88 views

How well will molten iron chrysolite (fayalite) react with hydrogen?

The equation balances nicely, but would the reaction tend to proceed this way? What temperature and time would be needed? $\ce{Fe2SiO4 + 2H2 -> 2H2O + 2Fe + SiO2}$ There is no problem with ...
4
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0answers
106 views

Sense of radii quotient to determine coordination number in crystals?

Every common textbook explains the method of the radii quotient between the cation and anion of a selected salt to determine to coordination number(s) in that salt. For example deduce "Inorganic ...
3
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53 views

Detect a baked diamond?

Diamond suppliers often "bake" stones. This causes them to expel yellow-causing nitrogen and become white, but also makes them more brittle. A baked diamond can often be recognized by its unnatural ...
2
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0answers
37 views

Can minerals form in the subsurface?

Can gypsum form in the subsurface? If there is another source of sulfate and maybe limestone dissolution happening, if the ionic strength is high enough can gypsum crystals form in groundwater?
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0answers
45 views

Reaction of getting jarosite from pyrite

I am doing a PhD about archaeometry in order to study the contaminations and alterations that occur to the ceramics which are buried in a marine environment. In my research, I have found pyrite in ...
1
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0answers
53 views

Is awaruite to nickel sulfate possible?

Much time has passed since my basic chemistry and I am trying to determine if an awaruite mine proposed by FPX Nickel Corp ("FPX") might serve as feed-stock to nickel sulfate for battery production. ...
1
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0answers
37 views

What does this chemical formula mean?

Wikipedia says the formula of aluminum oxynitride is this $\ce{(AlN)_x·(Al2O3)_{1−x}}$, $0.30 \leq x \leq 0.37$ . What does this formula mean?
1
vote
1answer
602 views

Hydrates and melting points

Basalt melting point: wet vs dry I had a student ask me this in class the other day; I thought about it, but I still can't work it out. Many mineral and rock hydrates (take basalt, for instance) ...
1
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0answers
52 views

What do you get when you melt and solidify sand?

Would you get something brittle like glass or something like granite?
1
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0answers
50 views

What needs to happen to this: Ca5(PO4)3Cl to get this: CaCl2?

$\ce{Ca5(PO4)3Cl}$ is a mineral called Chlorapatite So lets say I have some chlorapatite in my garage, what do I need to do to it so that I am left with Calcium Chloride $\ce{CaCl2}$?
0
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15 views

Nitrate reaction with iron minerals

I am trying to find literature or an answer to what happens to nitrate as it comes in contact with iron oxides. Does the nitrate get reduced to ammonium in all cases of iron(II/III) oxides? What is ...
-1
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1answer
33 views

How can I reduce sodium chloride levels in water, without removing other minerals?

How can I reduce sodium chloride levels in water, without removing other minerals? Good day, I make a sole from Himalayan Salt which I add to my Reverse Osmosis treated water to ensure my body isn't ...