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Posts posted by olmpiad

  1. Ok, most everybody knows that the cheap mischmetal used in firestarters is pretty much an alloy of Ce and Fe, along with trace amounts of Mg, Mn, etc. My goal is to extract the Cerium in a salt for from this. I have looked around, and found that Cerium Oxalate is not water soluble. I know that Iron Oxalate is quite water soluble from my mineral-collecting hobby (oxalic acid is used to turn ferroferrous dirt deposits in quarts in to iron oxalate, which then goes into solution, leaving the quartz spotless). Therefore, I should be able to have Cerium Oxalate precipitate out of a solution of the dissolved mischmetal by the addition of oxalic acid. My question is, should I just dissolve the mischmetal directly in oxalic acid, or should I dissolve it in something else, and react that with oxalic acid? If so which acid should I dissolve the mischmetal in? I will try to post pictures with my results (if my results end up positive).

  2. theres less astatine...or at least thats what they want me to think. actually come to think of it i just made a kilo of it by instantaneous alpha bombardment of finely dusted uranium intimately mixed with finely dusted bismuth...actually no, but thats a good way to multiply the amount of an element tenfold quickly


    Uranium dust is possible? I thought it was pyrophoric...

  3. Urine is brilliantly fluorescent (i found this out when I used the restroom at a party, scared the heck out of me!). For a more practical approach, take the felt cartrige out of a highlighter, and stir it in water until it has changed the color of the highlighter. You could also squeeze the felt tube, and let the ink drip into the water below.

  4. IIRC' date=' Realgar is not AsS, but As2S3:




    The reaction will be As2S3 + 3Fe ---> 2As + 3FeS


    Now you could redo you molar computations again.


    If you really want to do this in practice (???), then be EXTREMELY careful. Arsenic is very very toxic and it is among the most toxic elements. It also is a carcinogen. Without proper lab stuff, this is insanely dangerous to perform.[/quote']


    Actually, Realgar is AsS. As2S3 is the mineral Orpiment. Here are the references...


    Acta Crystallographica: 5: 775-782.


    Zeitschrift für Kristallographie: 136: 48-65.


    American Mineralogist (1972): 57: 524.


    Kyono, A., Kimata, M. & Hatta, T. (2005): Light-induced degradation dynamics in realgar: In situ structural investigation using single-crystal X-ray diffraction study and X-ray photoelectron spectroscopy. American Mineralogist 90, 1563-1570.


    Realgar does turn to orpiment over time if it is exposed to air and light, however, pure realgar is indeed AsS.

  5. YAAAY 20,001 post. Anyway, I typed this up the other day but I wanted to make sure that everything was accurate, is it?



    As Extraction From Realgar

    David Aldridge


    Arsenic can be won from realgar by reacting the powdered mineral with Fe filings. The result will be solid As, and solid FeS. This needs to be done under a hood, as some of the As is vaporised into Arsine.


    Fe: 1 Mole is equal to 55.847 g

    As: 1 Mole is equal to 74.92159g

    S : 1 Mole is equal to 32.066 g


    If we break up everything into 1/10th of a mole for each of the elements (The As and the S are still attatched, we are just figuring out how much of each element is present), we would find that 1/10th of a mole of each would equal...


    55.847g Fe = 5.6g Fe

    74.921g As = 7.5g As

    32.066g S = 3.1g S


    Thus, the approxamite amount of each chemical that woud be needed it as follows...


    10.8g AsS

    05.6g Fe


    In The End, we would obtain...


    8.9g FeS

    5.6g As


    The equation for this reaction would be as follows...


    AsS(s) + Fe(s) --> FeS(s) + As(s)




    ©2006 by David Aldridge

  6. Not quite right....but close. Sand is' date=' as you know, mostly quartz (SiO2).


    Quartz is what we call a resistate mineral, a phase that is highly resistant to both physical and chemical weathering. The fact that it is a resistate mineral means that it hangs around in the environment for a long time and can accumulate, while all of the other rock forming minerals (eg feldspars, clays, calcite, olivines, micas etc) are eventually all weathered or dissolved away. Although coral does occassionally get washed up on the beach, it doesn't hang around for very long because it is highly susceptable to both physical and chemical weathering. The accumulation of sand in this fashion is in fact how sandstone (and other sedimentary rocks) initially form.


    Other resistate minerals include rutile (TiO2), Zircon (ZrSiO4), and cassiterite (SnO2) and sand is often mined to retrieve these valuable minerals.[/quote']


    You forgot to mention Monazite, well, at least at some beaches...

  7. YT, back onto your expidetion for Sulfur, go to mindat.org, i post stuff there a lot, just go to the LOCALITY SEARCH and type in UK. That will give you a lot of localities, or search for sulfur under the MINERAL SEARCH, and when you get to the page on sulfur, click on "view all localities"

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