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Thread: Questions on apatite

  1. #1 Questions on apatite 
    Lover of Ideas jacate's Avatar
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    Hello, currently i am doing some research (Extended essay for the IB curriculum) and one of the main chemicals in concern for this research is the apatite group of chemicals. (Tooth decay if you are curious)

    I have been looking high and low and found the colors and some infomration on 3 of the 4 apatite which include Hydroxyapatite, Chlorapatite and Fluoroapatite which are white(or transparent) , green and yellow in color respectively.

    However i can't find much on Bromapatite nor confirm its color.

    In addition when i am trying to purchase the chemicals from the supplier they provided me with 2 types of hydroxyapatite which are fast flow and high resolution. What does fast flow hydroxyapatite or high resolution hydroxyapatite mean? I tried reading up what the ordering site provided as a basic description but i still haven't come to any conclusion of how different they are or what they are.

    Can someone help explain what is the difference between fast flow and high resolution and even what they mean in the first place as well as confirm the color on Bromapatite and if any link with information on it (not scholar articles since i have no access to them, which i wish i did) .

    Thank you!


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    Universal Mind John Galt's Avatar
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    I was hopeful of being able to help you out from the thread title, but my interest/knowledge relates around the geology of apatite as an accessory mineral. I have no idea about the specifics you ask. Have you tried google scholar?


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    Lover of Ideas jacate's Avatar
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    Quote Originally Posted by PhDemon View Post
    The only difference between the two types of apatite seem to be the "flow rate" and binding properties. I found this link:

    http://scbtrack.wfu.edu/Poole-files/...r_An_Bioch.pdf

    which may be helpful. In case you can't open it the key bit is:
    "Hydroxyapatite is a form of calcium phosphate that has long been used in the chromatographic separation of proteins andDNA[1]. Hydroxyapatite is best known as a crystalline material but is now available in a range of ceramic derivatives that are vastly superior in terms of flow rate, stability, and reproducibility over many cycles of use."

    The "fast flow" and "high resolution" will be two different "ceramic derivatives" optimised for particular chromatographic techniques.

    As for the colour of bromapatite I couldn't find any information...
    Thank you so much for the effort =D at least it clears up one of the question and that i won't be getting any of those. Thank you so much =3

    Quote Originally Posted by John Galt View Post
    I was hopeful of being able to help you out from the thread title, but my interest/knowledge relates around the geology of apatite as an accessory mineral. I have no idea about the specifics you ask. Have you tried google scholar?
    Sorry that i didn't attend to your area of knowledge. However i am glad you are keen to help thank you =D Also i tried google scholar, if the articles were more accessible X(
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    Lover of Ideas jacate's Avatar
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    Sorry for double posting, but i have another question to add, is it even possible to make Calcium Iodine-apatite? If so is there any info on it? I just did a read up on it and technically what 2 research papers say is that it are possible.
    Last edited by jacate; August 19th, 2013 at 08:31 AM. Reason: Removing ".... What?!"
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  6. #5  
    Lover of Ideas jacate's Avatar
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    Quote Originally Posted by PhDemon View Post
    This may be useful:

    http://www.minersoc.org/pages/Archiv...36-281-654.pdf.

    It says: "Some synthetic lead apatites have been prepared that contain iodine, but other apatites containing iodine are unknown"
    I'm guessing it's due to the relative sizes of Ca/I and Pb/I...
    Thank you, that is the exact same paper i got for researching. This is another paper, you can read the sample which indicates the preparation of Iodine apatite Preparation and characterization of hydroxyl and iodide apatites of calcium and their solid solutions - Springer Sadly i can't access the full article =/ just 2 pages.
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  7. #6  
    Lover of Ideas jacate's Avatar
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    Quote Originally Posted by PhDemon View Post
    I can access the paper and the whole thing is only 3 pages so I don't think you're missing much (the last page contains a figure of unit cell volume per mol% I - a straight line ranging from 0.528 nm3 at I = 0% to 0.544 nm3 at I = 100%; an electron miscroscope picture of the crystal and the references).
    Ever grateful for your effort =D
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  8. #7  
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    Bromine compounds have a tendency to be brown if that helps.
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  9. #8  
    Lover of Ideas jacate's Avatar
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    Quote Originally Posted by Sealeaf View Post
    Bromine compounds have a tendency to be brown if that helps.
    True, but there isn't any papers to quote its appearance or even an iodine-apatite. I will try to see if i can get the colors out first before conducting the experiment.
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