Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Feb 21, 2015 22:48:30 GMT -5
woohoo! RESULTS!!!
==============================
The mystery metal was pretty straightforward. It's about 81% manganese and 16% iron with the remainder being traces of silicon and aluminum. Most likely these are oxides since there wasn't anything much in the way of counterions - no sulfur, too little silicon, etc.
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Post by Pat on Feb 21, 2015 23:07:34 GMT -5
So, are those the ingredients of meteorites? Does this rock have a name?
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Post by snowmom on Feb 22, 2015 7:36:18 GMT -5
phew, thanks for relief of suspense... love a mystery, but especially love to see one solved!
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Post by radio on Feb 22, 2015 9:48:21 GMT -5
Any idea as to origin? Naturally occurring, slag or byproduct?
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Post by vegasjames on Feb 22, 2015 16:52:07 GMT -5
So, are those the ingredients of meteorites? Does this rock have a name? Definitely not meteorite.
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Post by vegasjames on Feb 22, 2015 16:55:42 GMT -5
This should help: metals.about.com/od/properties/a/Metal-Profile-Manganese.htm"Ferromanganese, which contains 74-82 % manganese, is produced and classified as high carbon (>1.5% carbon), medium carbon (1.0-1.5% carbon) or low carbon (<1% carbon). All three are formed through the smelting of manganese dioxide, iron oxide and coal (coke) in a blast or, more often, an electric arc furnace. The intense heat provided by the furnace leads to a carbothermal reduction of the three ingredients, resulting in ferromanganese."
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Post by gingerkid on Mar 4, 2015 13:22:14 GMT -5
The mystery metal was pretty straightforward. It's about 81% manganese and 16% iron with the remainder being traces of silicon and aluminum. Most likely these are oxides since there wasn't anything much in the way of counterions - no sulfur, too little silicon, etc. Congrats, @shotgunner! So, is it ferromanganese as vegasjames suggested? vegasjames, I was surfing the internet and wanted to ask you what exactly is troilite? I read it's iron sulfide inclusions found in some meteorites, and that it's non-magnetic? Is it also found in some serpentinite?
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Post by rockjunquie on Mar 4, 2015 15:00:44 GMT -5
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Post by vegasjames on Mar 5, 2015 18:35:19 GMT -5
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Post by gingerkid on Mar 9, 2015 14:54:41 GMT -5
Thank you, vegasjames! Thanks for sharing your pic of your Odessa iron meteorite slab with troilite inclusions. Nice specimen!!
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Post by vegasjames on Mar 9, 2015 19:50:53 GMT -5
I like that slice a lot. The Odessa has the most interesting etch pattern I have seen in any iron meteorite. Toluca is pretty interesting as well since it actually shown two separate etch patterns. It has a pattern of a coarse octahedrite as well as plessitic needles. Troilite is also common in Toluca.
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,159
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Post by jamesp on Mar 11, 2015 4:13:39 GMT -5
woohoo! RESULTS!!! ============================== The mystery metal was pretty straightforward. It's about 81% manganese and 16% iron with the remainder being traces of silicon and aluminum. Most likely these are oxides since there wasn't anything much in the way of counterions - no sulfur, too little silicon, etc. Iron and manganese with a bit of carbon is hard on diamond tools. And carbide tools. Best not sawn with a fine lapidary diamond blade. Best sawn with bonded abrasive blade that sheds abrasive to reduce heat at cut. Mangenese carbide, mangalloy, cast iron, pig iron, all treacherous to cut. worst of the worst
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