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Found NE Afrcia By Locals

Posted by Eamon Allstone  
Found NE Afrcia By Locals
February 27, 2012 10:37PM
Hi All

I am totally new to rock collecting the attached were found in NE Afrcia by locals, given to a friend of mine & then given to me as a gift , I am looking for help to identify them , any help as to were i should futher my research or hints as to what they maybe be welcomed, i have been searching last few week now with Google images etc.



Thanks in Advance







Edited 2 time(s). Last edit at 03/03/2012 04:07PM by Eamon Allstone.
Re: What Have I Got #2
February 27, 2012 10:48PM
More for You









Edited 1 time(s). Last edit at 03/03/2012 04:21PM by Eamon Allstone.
Re: What Have I Got #3
February 27, 2012 11:02PM
More









Edited 1 time(s). Last edit at 03/03/2012 04:23PM by Eamon Allstone.
Re: What Have I Got
February 28, 2012 01:26AM
Eamon,

welcome aboard!
It is very hard to tell what you have, some are rocks, that is, mixtures of minerals, so they don't define real easy. The top one of the nine is iron stained, limonite, i'd guess, have to clean it to see what is under it. The fourth down has some crystals, pyrite is extremely common, so that would my first guess. Go to the library too, and thumb through some of the mineral books there, take a few home.
Does your friend know more specifically where in africa, and is he into minerology at all? Some of these look metamophic to me. Is the 9th down attracted to a magnet? i'd guess magnetite, if so. Which ones are unusually heavy for their size; do you know what 'specific gravity' is? We need a little more background to help, I think.
Hope this helps

Mike
Re: What Have I Got
February 29, 2012 10:46PM
Can anyone help me any futher here? I am trying to find a N52 magnet here & have ordered an accurate scales to work up the SG

Thanks in advance
Re: What Have I Got
March 01, 2012 01:24AM
"Rock 4" looks like a piece of granite (or maybe granitic pegmatite). You can see large mica crystals along with feldspar and quartz.

"Rock 1" looks like a pyrite nodule (inner, gold color) that has oxidized around the edges to limonite (rusty). It might also be just a thin layer of pyrite on top of some rock...
Re: What Have I Got
March 01, 2012 04:57AM
Eamon'

A very old, and even dearer friend used to tell me, about every complicated mess I (or whoever) faced, "These things take time." You will find that is true of mineralogy, too. Very complicated, sometimes very messy. (especially in the definitions-arena!). I've only been into it a few years, checked out a lot of library books, looked at lots of mindat photos, but i'm still so green. But each time I go back to places I've rockhounded awhile before, I see it w/ 'new eyes', a feeling that I've grown a little, and appreciating more what I'm noticing. That is a beautiful high to be on, but again, that takes time...and will keep taking time. Enjoy it. If someone could tell you everything you have, that would be handy, but you'd miss out on a lot.
I hope you don't feel I'm down on you,I'm not, and I can only guess at the intonation of what you type. I was in an awful hurry to make up for lost time when i got into this. I remember Clarences' words, (the old man) maybe others can appreciate his perspective.

Mike
PS mentioning the example of definitions is a nod to Amir, Reiner, Norman, and not a few other threaders...
Re: What Have I Got
March 01, 2012 10:44PM
More Pics of Sample 4









Edited 1 time(s). Last edit at 03/03/2012 04:26PM by Eamon Allstone.
Re: What Have I Got
March 01, 2012 10:50PM
I think this may be Magnesite due the white streak am i way off the mark here









Edited 3 time(s). Last edit at 03/04/2012 03:37PM by Eamon Allstone.
Re: What Have I Got
March 01, 2012 11:35PM
Sample 4e looks like chlorite schist with cubic pyrite crystals in it. Similar material was found about 50 years ago near Chester, Vermont.
Re: What Have I Got
March 01, 2012 11:44PM
White Streaks







Edited 1 time(s). Last edit at 03/03/2012 04:32PM by Eamon Allstone.
Re: What Have I Got
March 01, 2012 11:59PM
More pics of Sample 1 posted yesterday









Edited 1 time(s). Last edit at 03/03/2012 04:33PM by Eamon Allstone.
Re: What Have I Got
March 02, 2012 12:12AM
More pics of Sample 3 posted yesterday









Edited 1 time(s). Last edit at 03/03/2012 04:35PM by Eamon Allstone.
NE Afrcia Landscape
March 02, 2012 12:56AM
Any Ideas









Edited 1 time(s). Last edit at 03/03/2012 04:36PM by Eamon Allstone.
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