Help mindat.org|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on MindatThe Mindat Store
Minerals by PropertiesMinerals by ChemistryRandom MineralSearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
StatisticsThe ElementsMember ListBooks & MagazinesMineral Shows & EventsThe Mindat DirectoryHow to Link to MindatDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery
bannerbannerbannerbannerbannerbanner
avatar
Jenna Mast February 11, 2012 01:44AM
As I did not have an air compressor, I decided to use a steel brush attachment that came with my dremel to remove lepidolite coatings from tourmaline that I couldn't removing any other way. This works, however it also leave a thin metal deposit on the crystals. I only did a test section. I don't want to continue until I know how to remove the deposit. Does anyone have any suggestions?

Jenna
avatar
Joseph Polityka February 11, 2012 02:36AM
Jenna,

Try using a wet Brillo Pad. I have used them with harder gem minerals to remove thin coatings.

Best,

Joe
avatar
Luca Baralis February 11, 2012 10:54AM
I don't use steel brush on hard rocks for this reason.
Some ideas:
toothpaste and brush (and time...)
acid
ammonia
polish paste/pad for metals objects
an home made electrolytic device

However I've never tried any of that.

Luca Baralis



Edited 1 time(s). Last edit at 02/11/2012 10:55AM by Luca Baralis.
avatar
William C. van Laer February 11, 2012 03:59PM
Jenna:

Complete removal is somewhat dependant on what type of metal brush you used: steel wire would require a soaking in warm/hot hydrochloric acid (muriatic acid), while a brass brush would require a soak in waek nitric acid. Both reactions would be facilitated by adding heat, but either will give off noxious fumes, so please use caution and do this under a fume hood.
Chris

William C. (CHRIS) van Laer: "I'm using the chicken to measure it..."
avatar
Jenna Mast February 12, 2012 06:42AM
Thanks for the suggestions everyone. I'll see if I can give some of them a try.

Jenna
Sorry, only registered users may post in this forum.

Click here to login



bannerbannerbannerbannerbannerbanner
Mineral and/or Locality  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2017, except where stated. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: April 25, 2017 17:36:39
Go to top of page