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GeneralFlambeau Mine chalcocite
14th Nov 2011 17:56 UTCRaymond Lasmanis
14th Nov 2011 18:02 UTCRob Woodside 🌟 Manager
14th Nov 2011 18:15 UTCJolyon Ralph Founder
I wonder if it's related to airborne pollution rather than humidity/temperature?
Jolyon
14th Nov 2011 18:19 UTCRob Woodside 🌟 Manager
14th Nov 2011 18:58 UTCSteve Hardinger 🌟 Expert
So I would be cautious about making any connections based on locality and susceptibility to decomposition without more thorough consideration of all the variables involved.
14th Nov 2011 21:03 UTCRick Dalrymple Expert
I also lost a large pyrite/marcasite nodule from France (i think). It was about 10 pounds and the size of a cantelope. Now it is a bag of crumbs and it is seems to be breaking down further. Soon it will be the size of flour. I put it in a zip lock bag, after giving it a bleach soak & distilled water rinse, when I noticed it deteriorating a couple of years ago. The bleach didn't stop it from deteriorating.
I have also noticed many of my Butte covellite, pyrites, chalcocites, and chalcopyrites start to "oxidize". Many I have had for over 20 years and have just noticed the discoloration start now. My best covellite no longer has any color to it. It is just black! And my others are loosing their color.
14th Nov 2011 22:17 UTCRaymond Lasmanis
14th Nov 2011 22:20 UTCJolyon Ralph Founder
14th Nov 2011 23:12 UTCPaul Brandes 🌟 Manager
All of my specimens are kept in painted birch display cabinets and I have not noticed any decomposition, including my Flambeau chalcocites.
14th Nov 2011 23:24 UTCRick Dalrymple Expert
14th Nov 2011 23:40 UTCJolyon Ralph Founder
Specimens in LA museum were stored in metal display cabinets using acid-free paper boxes, etc, but still suffered from scuzzing.
Oak cabinets should be avoided in particular as they are well-known to release more acetic and formic acid than other normal woods - but this is more of an issue for carbonates (see http://en.wikipedia.org/wiki/Byne%27s_disease) than for your sulphides.
Jolyon
15th Nov 2011 11:06 UTCRay Hill Expert
It anyone ever uncovers that culprit, if this is the vector, it might become a useful tool in non sulfur realease
treatment of sulphide ores...who knows.
15th Nov 2011 11:10 UTCJolyon Ralph Founder
15th Nov 2011 12:17 UTCErik Vercammen Expert
15th Nov 2011 14:10 UTCReiner Mielke Expert
I have lots of oak trees in my yard I will have to make myself some Calclacite! But wait! I guess it wouldn't be a valid mineral species because of the new criteria established by the IMA. Damn!>:D<
15th Nov 2011 14:46 UTCBart Cannon
It's microbes that facilitate the alteration of sulfides. Over the millenia, they have produced every lovely and ugly secondary mineral in your collections. There would be no supergene alteration without them.
Kill the microbes and enjoy the stifling of the hated decomposition of, and coatings on your stored sulfides.
Sulfide metabolizing microbes such as thiobacillus inhabit every surface and pore of the planet including metal and wooden drawers as well as museum boxes and acid free labels.. And they are happy, sometimes, thousands of feet below the surface.
Kill them.
Janitor in a Drum, bactine, listerine, lysol etc.or some other "germicides" might help. Maybe lysol infused labels instead of acid free labels might be a better approach.
I highly recommend you all to obtain a copy of:
Reviews in Mineralogy MSA Volume 35 .
"Geomicrobiology"
Interactions Between Microbes and Minerals 1997 edited by Paul H. RIbbe.
15th Nov 2011 15:01 UTCJolyon Ralph Founder
Jarosite on Mars does not mean there's life there.
15th Nov 2011 15:27 UTCBart Cannon
Not that I have that much respect for NASA.
Find me a thiobacillus-free crumbled marcasite and I will accept your position.
Thiobacillus assays of soils are used by modern mining companies for base and precious metals prospecting.
A better sulfide pathfinder than iron concentration and sulfur concentration in a bulk ICP or XRF analysis. Lots of thiobacillus equals lots of pyrite instead of just lots of magnetite or gypsum.
On Earth, I'll admit..
Have you read Geomicrobiology? If not, I'll loan you my copy.
16th Nov 2011 00:54 UTCNathalie Brandes 🌟 Manager
19th Nov 2011 14:49 UTCJohn Mason Expert
I still have a few specimens though had to dump some. Of the ones that were stored at another location - where the temperature was way, way higher - not one remains.
If I ever collect any more, I know exactly where I will store them: in the fridge. This may be a useful tip for anyone with sulphide specimens that they have concerns about.
Cheers - John
4th Mar 2012 14:26 UTCGeorge Marshall
It has been stored in a damp basement for 7 years, a tool shed for 7 more and in a house prior. There is absolutely no sign of decomposition or oxygenation or otherwise.
I have other specimens, collected in the Hardin Co. Illinois Fluorite district that have been stored along side of the Flambeau that are rapidly turning to dust.
I believe it could be microbes, but humidity and oxygen seem to also be factors.
4th Mar 2012 14:46 UTCAlfredo Petrov Manager
4th Mar 2012 18:47 UTCPaul Brandes 🌟 Manager
4th Mar 2012 19:39 UTCRob Woodside 🌟 Manager
4th Mar 2012 20:01 UTCMichael Hatskel
6th Mar 2012 18:24 UTCchay murphy
15th Mar 2012 15:35 UTCchay murphy
15th Mar 2012 23:07 UTCRob Woodside 🌟 Manager
22nd Mar 2012 10:13 UTCChris Stanley Expert
bws
Chris S
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