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 GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportAdd Glossary Item
StatisticsMember 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

columbite with matrix or not?

Posted by Pekka Ruoho  
avatar columbite with matrix or not?
August 01, 2012 03:51PM
    
I am trying to clean a small piece (crystals) of columbite from Kaatiala in Finland.
http://kivisivut.travelnet.fi/col1.jpghttp://kivisivut.travelnet.fi/col2.jpg
..and I would like to get second opinion. Should I try to clean away all feldspar and small parts of columbite crystals on the top of it, or
should I leave the matrix. I am pretty sure that there are more well terminated crystals inside of feldspar.
avatar Re: columbite with matrix or not?
August 01, 2012 04:07PM
Its not a bad specimen as it is. I would use the high pressure water from one of the new spot cleaning guns that are in common use by dry cleaners to see what I could clean off. Then I would probably use a small pneumatic hammer to try and remove a little of the feldspar to see if any significant other columbites? were worth exposing. Then I would put it in iron out to remove the minor "iron" staining.

Rock Currier
Crystals not pistols.
avatar Re: columbite with matrix or not?
August 01, 2012 05:40PM
Since it is already so good, I would keep it as it is.
Is it a recent find?

cheers
Re: columbite with matrix or not?
August 01, 2012 05:45PM
    
Hi Pekka
If I where you, I where very contented for the specimen as it is, because the columbites are very fragile and even small
vibrations, can do that you, got some of the crystals broken. Do not that problems to you!!
Try only oxyal acid for the rust, or any other thing good for removing the same.

Terv. / Ulf thumbs up
avatar Re: columbite with matrix or not?
August 01, 2012 06:58PM
    
Thanks all!
I just removed broken pieces of feldspar and found even in top part one terminated crystal. Here some new pics.
http://kivisivut.travelnet.fi/col3.jpghttp://kivisivut.travelnet.fi/col4.jpghttp://kivisivut.travelnet.fi/col5.jpg
.. now it is taking bath. I have broken many big rocks in Kaatiala and have many "singel" crystals. This time I took with me a smaller rock with broken crystal on surface. When I hammered it at home I found many small crystals and this group, which I like for its estetical look.
rgds PekkaR
Author:

Your Email:


Subject:


Attachments:
  • Valid attachments: jpg, gif, png, pdf
  • No file can be larger than 1000 KB
  • 3 more file(s) can be attached to this message

Spam prevention:
Please, enter the code that you see below in the input field. This is for blocking bots that try to post this form automatically. If the code is hard to read, then just try to guess it right. If you enter the wrong code, a new image is created and you get another chance to enter it right.
CAPTCHA
Message:


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 1993-2015, 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 21, 2015 02:38:07