Help needed - "rust" on a JAH-055 OC L4-5 or?
Posted 04 January 2014 - 05:30 PM
A few years ago I bought a beautiful slice of Jiddat al Harasis 055 (OC L4-5). The specimen was perfect last year.
My annual review of the collection showed that my JAH 055 slice, is now in very poor condition. I certainly looks like rust, but I think there's more to it.
So the question for the experts. What is happening and can I restore and stop this?
under the microscope - low power
The Glory Days
Posted 04 January 2014 - 09:09 PM
Posted 05 January 2014 - 09:19 AM
So this is how lawrencite disease looks like. Well I'm going all in, After cleaning and some sanding to remove the rust and droplets, I've wrapped the slice lightly into alu-foil and dropped it in a jar with distilled water. The jar with the distilled water, alu-foil and slice is then heated in water-bath to almost boiling. Last a teaspoon of sodium carbonate and the process begins.
It will stay there for the next couple of hours, then cleaning and another run and so on.
I'll keep you posted.......
Hopefully my fist and last specimen with lawrencite disease.
In the meantime I'll acquire some more meteorites. I'm expanding in the iron department at the moment. Also looking for a small Almahata Sitta sample with a little crust and a with all the fuss about Katol a few days ago, a small slice of that too. Collecting seems to be a "fever" that can't be cured, only treated for the symptoms by acquiring more sample
Posted 05 January 2014 - 10:35 AM
Posted 05 January 2014 - 04:30 PM
Thanks for this thread - please send updates!
Posted 05 January 2014 - 05:56 PM
Here's the first update.
The process I used was this:
Today the slice was cleaned, sanded a little and dropped in the sodium carbonate solution 3 times for two hours. The cleaning was done cleaning gasoline, alcohol and WD-40 - in that order.
The hot solvent broke the slice at a weak point, but it seems to have removed the problems. But how to determine that?
It will now be stored in "dry box" for the next week or so.
If it continues to look good then I will do a high-gloss polish.
Some pics. after the "galvanic process"