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

Posted: April 16th, 2014, 5:03 pm
by sofossils
[img]http://upload.wikimedia.org/wikipedia/commons/2/20/Galena,_Calcite,_Fluorite-274395.jpg[/img]

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

Posted: April 16th, 2014, 5:06 pm
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

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

Posted: April 17th, 2014, 7:54 am
by sofossils
Correct! It was a beautiful specimen

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

Posted: April 20th, 2014, 6:22 am
by solakmagic
[img]https://encrypted-tbn1.gstatic.com/images?q=tbn:ANd9GcRjd-L39FsMVLPEpbkuKTwkBsi0lbcZvLqy1i4HGeJ36_YuzVRg[/img]

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

Posted: April 22nd, 2014, 10:50 am
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...)

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

Posted: April 22nd, 2014, 11:57 am
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]
Your turn!

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

Posted: April 23rd, 2014, 8:28 am
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]

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

Posted: April 23rd, 2014, 11:41 am
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

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

Posted: April 25th, 2014, 2:12 pm
by inluvwyth_WANTED
No. They are not the same...Try again? :)

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

Posted: April 25th, 2014, 7:16 pm
by solakmagic
Hematite up top, Magnetite below!  Hematite Fe2O3, Magnetite Fe3O4 or more specifically Fe(2+)2Fe(3+)O4