Thought I would share my space rocks.
3 of them need a lime bath to remove some rust, but I think they are beyond cool.
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Posted 18 May 2021 - 07:34 PM
I see what looks like a couple of Canyon Diablos in the top row, maybe a Campo del Cielo at bottom right and possibly top center. Maybe a Sikhote-Alin bottom left. I do like irons. Please identify these for the group!
Posted 18 May 2021 - 10:20 PM
There are only 4, some of the pics are the same.
1st is a canyon diablo. Pic below it is the same.
Bottom left is a nantan.
Top right and bottom right is a quad cut ciello
Middle right is a sikhote.
Posted 19 May 2021 - 06:55 AM
I think there is a difference in the orientation of the pics we're seeing. I see two horizontal rows of three across. The two Campo pics are easy enough, the only cut pieces are top center and bottom right. The bottom left, with one smooth end and the opposite coarsely textured, has the appearance of a Sikhote. The coarse one at bottom center would appear to be a Nantan. Middle right? No such position in what I'm seeing, that's what leads me to believe we're seeing a different arrangement.
Posted 19 May 2021 - 08:16 AM
That is correct. Mine were 2 vertical rows of 3....maybe mobile vs full sight maybe.
Posted 19 May 2021 - 08:31 AM
Nice specimens. Thanks for sharing them.
I wouldn't suggest using lime on those. The rust looks superficial and is not worth using a harsh treatment. Use a wire brush to remove the surface rust and bake them in the oven at 200F for a few hours. After they cool off, give them a good wipe down with an oily cloth. Repeat as needed.
Lime is pretty harsh and depending on what solution or product you use, you could trigger more problems than rust, like lawrencite disease.
Posted 19 May 2021 - 01:43 PM
Michael is quite right, a light oil application would be best. The brand G-96 gun oil is the one I prefer, others swear by transmission fluid. Both contain anti-corrosion additives. The rust visible in the pics is minimal at most. There is no evidence of lawrencite disease that I can see, which is a consequence of chloride contamination. Chlorine is present in bleaches and tap water, and no cleaner containing any amount should ever be used on iron meteorites. The weak acids in lime-away type products will remove much of the rust, but they will also remove any patina if used too aggressively. Sikhotes should never be treated that way, they're one of the few common irons often still retaining an original fusion crust.
Posted 19 May 2021 - 01:45 PM
And, oil soaked cloths should be properly disposed of due to the potential for spontaneous combustion...
Posted 19 May 2021 - 02:12 PM
Posted 19 May 2021 - 02:38 PM
Posted 19 May 2021 - 02:45 PM
Rubbing alcohol is 70% isopropyl, the rest is water. Unless the added water is distilled, there's an outside possibility of chlorine being present. The sodium hydroxide is fine, but mix it with distilled water, or even rainwater. However...this treatment is only effective in removing chlorides, it with not mitigate any rusting. If there is no evidence of 'lawrencite disease', i.e. yellow droplets forming on a surface, or 'veins' of rust along the spaces between the crystal plates (in the Campo), there's no point. If it is used to treat lawrencite, the specimen should be immersed for at least a month, soaked clean in distilled water for a few days, and then dried and oiled as Michael has suggested.
Posted 19 May 2021 - 02:53 PM
BTW I love Iron meteorites. Sikhote I'd probably my favorite, but any decenly sized piece is ridiculously pricey. Looking to add me a nice etched iron...I may go for one of those etched meteorite orbs....who knows
Sikhotes are nice, particularly ones completely covered with regmaglypts, as opposed to the' shrapnel' variety. It's pretty difficult to find a nice specimen for less than $3 per gram these days, and twice that amount is not unusual.
Spheres are nice, especially fine octahedrites like Gibeon and Muonionalusta. Seymchan is also not too hard to find. Spheres tend to be expensive though, because there's so much waste generated during their production.
Posted 23 May 2021 - 01:04 PM
Wonderful Grand Specimens ! Thanks for sharing. To all who discussed afterwords thanks for the learning opportunity.
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