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Tetrahedrite

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Everything posted by Tetrahedrite

  1. Are you refering to "dissolved" gold, or gold in the sediments?
  2. For everyone's information....... Although gold is most commonly found as pure gold (and Au-Ag alloys), other gold minerals aren't all that uncommon in high temperature mineral deposits. Au commonly forms compounds with tellurium, selenium, even sulfur and antimony. Au-chloride complexes are extremely common in nature and are important in enrichment processes. Some bacteria are even known to metabolise gold as a part of their energy cycles!! So the laboratory isn't the only place Au compounds exist.
  3. In light of your (sometimes seemingly irrational) views in this thread, this is not a question you really want to hear an answer for. Killing for revenge belongs in places like Sudan and Jordan, not in the (supposedly) civilised US of A. In my books, people who kill for revenge are still murderers, no matter what type of spin you put on it.
  4. I think the answer to this question is best found in nature. I will explain. In this case I would descibe inert metals as those that are found mostly in a native state in the environment. These include Au, Pt, Ir, Os, Pd, Rh, Ru. Metals such as Hg, Ag and Cu are certainly known as native metals, but are more commonly found in an oxidised state. For example both Hg and Ag are commonly found in sulfides (cinnabar, acanthite) and sulfosalts (tetrahedrite for example, see the name; I know what I'm talking about ), and in halides (calomel and chlorargyrite to name but a few). As far as I am aware, Ni is never found on earth as the native metal (except in meteorites) and is almost exclusive found as Ni2+ and very occasionally Ni3+.
  5. For the record, I find it absolutely ludicrous that a murder conviction can be overturned in this fashion. However, I was not at all suprised that this did happen. As the dissenting judge pointed out, the pins were just a way for the family to grieve, and I really don't think it would have biased the jury at all. It really seems like common sense should have prevailed here.
  6. I probably wouldn't include Ag, and most definitely wouldn't include NI.
  7. I would have to disagree with that statement. Replace "most" with "some". It is also worth noting that CuSO4 does occur in nature without any waters of hydration (chalcocyanite). Other hydration states also exist: CuSO4.H20 Poitevinite CuSO4.3H2O Bonattite CuSO4.5H20 Chalcanthite CuSO4.7H2O Boothite (a very rare mineral that I have recently written a paper on) Each of these species have different crystal structures and definite stoichiometric amounts of water, which means the water can't really be called an impurity.
  8. I am refering to the USA, and in particular to imprisonment without charge (Abu Ghraib + Guantanamo Bay, which have been discussed at length in other threads), and the use of torture as an interrogation technique (this is not exclusive to the USA). The use of torture, which I find particularly repugnant, assumes that the person is guilty from the start, and allows the person to be subjected to brutal and inhumane treatment without the benefit of a trial to establish their innocence/guilt.
  9. I hope you don't take anything you see on FOX News seriously?
  10. I think events of the recent past have showed that this is not necessarily the case....
  11. I'll still be laughing next sunday!!!!!
  12. I suspect you don't understand the meaning of "communist", or are you just doing the typical American thing and using it as a derogatory term? I agree. How about China takes over the world. They have the biggest population, so why not!
  13. With that much salt, chlorine gas was probably formed during the reaction. I have seen the same green gunk using graphite electrodes. I really don't know what it could be, but i'm sure someone here will.
  14. This is one of the rare times I completely agree with syntax. The best person for the job should get the job, I say.
  15. In this connection, liberal governments tend to make changes for the better, although the population will often not agree at the time. Preserving the status quo at all costs is not beneficial to society. The conservative government in Australia is often accused of trying to take us back to the 50's, as their policy decisions are often regressive, not progressive.
  16. Yes, there is no chance of azurite forming under normal lab conditions, unless you are using carbonate solutions. The "p" means partial pressure in a gaseous mixture ( in this case, the atmosphere). It is like a concentration term for gases. A pCO2 of 10^-3.5 is equivalent to around 0.032% CO2 in the atmosphere. A pCO2 of 10^-1.36 is equivalent to around 4.37% CO2.
  17. Iraq was probably a much safer place for civilians under Saddam's rule than before the enforcers arrived. Ironic, no? There would have been one sure-fire way to prevent thousands of your countrymen coming home in wooden boxes.....
  18. The exact opposite would happen. Arming Taiwan with nukes would just cause an arms race in Asia. I think you'll find he's refering to Iraq!!
  19. I always thought the US was trying to destroy the world with its foreign policy.....apparently I was wrong!!!!
  20. It really is quite simple. Using the simple formula they give you, the only possibility is numbers that are a multiple of nine eg 9, 18, 27, 36, 45, 54, 63, 72, 81. All of these numbers will be the same celebrity.
  21. Correction. Conservative, right wing Americans are evil. Some of your/their views make me sick to the stomach. *decides to put on bullet proof vest*
  22. Yes, malachite is formed in nature the same way. There is an interest thermodynamic oddity here...... At atmospheric pCO2 (10^-3.5) the product is always malachite, Cu2CO3(OH)2. When the pCO2 is increased (ie in carbonate solutions in the ground) to 10^-1.36 or above, a different compound is formed. This is called azurite, Cu3(CO3)2(OH)2, and rather than being green, it is brilliant blue.
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