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 »

[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 »

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 »

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

Post by solakmagic »

[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 »

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 »

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 »

[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 »

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 »

No. They are not the same...Try again? :)
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Re: Rocks & Minerals B/C ID/Question Marathon

Post by solakmagic »

Hematite up top, Magnetite below!  Hematite Fe2O3, Magnetite Fe3O4 or more specifically Fe(2+)2Fe(3+)O4
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