Rocks & Minerals B/C ID/Question Marathon

Test your knowledge of various Science Olympiad events
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sofossils
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Re: Rocks & Minerals B/C ID/Question Marathon

Post by sofossils » April 16th, 2014, 5:03 pm

[img]http://upload.wikimedia.org/wikipedia/commons/2/20/Galena,_Calcite,_Fluorite-274395.jpg[/img]
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Re: Rocks & Minerals B/C ID/Question Marathon

Post by solakmagic » April 16th, 2014, 5:06 pm

sofossils wrote:
[img]http://upload.wikimedia.org/wikipedia/commons/2/20/Galena,_Calcite,_Fluorite-274395.jpg[/img]
Wow, beautiful!
Galena, Fluorite, aaaaand Calcite
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Re: Rocks & Minerals B/C ID/Question Marathon

Post by sofossils » April 17th, 2014, 7:54 am

Correct! It was a beautiful specimen
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Re: Rocks & Minerals B/C ID/Question Marathon

Post by solakmagic » April 20th, 2014, 6:22 am

[img]https://encrypted-tbn1.gstatic.com/images?q=tbn:ANd9GcRjd-L39FsMVLPEpbkuKTwkBsi0lbcZvLqy1i4HGeJ36_YuzVRg[/img]
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Re: Rocks & Minerals B/C ID/Question Marathon

Post by inluvwyth_WANTED » April 22nd, 2014, 10:50 am

Epidote or Apatite. The structure looks like apatite but the color (I know I know, we're not suppose to rely on this but...)

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Re: Rocks & Minerals B/C ID/Question Marathon

Post by solakmagic » April 22nd, 2014, 11:57 am

Apatite!  I think that white scarring/ghosting/impurities/whatever you want to call it is really indicative of Apatite, though it can be confused with Sodalite.  A good example of what I'm talking about is on this specimen [img]http://www.charmsoflight.com/Images/Gemstones/Apatite%20rough%20crystals.jpg[/img]
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Re: Rocks & Minerals B/C ID/Question Marathon

Post by inluvwyth_WANTED » April 23rd, 2014, 8:28 am

[img]http://skywalker.cochise.edu/wellerr/mineral/hematite/6hematite-sliman3431a.jpg[/img][img]http://rruff.info/repository/sample/by_minerals/Magnetite__R080025__Sample__Photo__22213__M.jpg[/img]

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Re: Rocks & Minerals B/C ID/Question Marathon

Post by solakmagic » April 23rd, 2014, 11:41 am

inluvwyth_WANTED wrote:
[img]http://skywalker.cochise.edu/wellerr/mineral/hematite/6hematite-sliman3431a.jpg[/img][img]http://rruff.info/repository/sample/by_minerals/Magnetite__R080025__Sample__Photo__22213__M.jpg[/img]
Hematite, chem form Fe2O3
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Re: Rocks & Minerals B/C ID/Question Marathon

Post by inluvwyth_WANTED » April 25th, 2014, 2:12 pm

No. They are not the same...Try again? :)

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Re: Rocks & Minerals B/C ID/Question Marathon

Post by solakmagic » April 25th, 2014, 7:16 pm

Hematite up top, Magnetite below!  Hematite Fe2O3, Magnetite Fe3O4 or more specifically Fe(2+)2Fe(3+)O4
"Genius is one per cent inspiration, ninety nine per cent perspiration" - Thomas Alva Edison

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