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

Please ID - Chromite? Chromiumite?

Posted by claire Brimson  
Please ID - Chromite? Chromiumite?
April 09, 2012 06:48AM
Hi

These were found again in Kemi, Finland. Kemi apparently has a Chromium plant/mine area which is outside of Kemi, these were found near the harbour.

Are the crystals Chromite? Why is the rock purple? Streak was blackish.

Also, when white light shines onto it, the purple becomes very strong purple colour. Why is that?

Many thanks

Claire
Attachments:
open | download - 003.JPG (165.5 KB)
open | download - 007.JPG (138.1 KB)
open | download - 009.JPG (207.5 KB)
avatar Re: Please ID - Chromite? Chromiumite?
April 09, 2012 02:53PM
    
Hi Claire,

I think you're correct about the little black octahedral crystals being Chromite. This looks very much like Chromite ore. I think that the purple colored mineralization may be Chromian Clinochlore like this: http://www.mindat.org/photo-108220.html Good luck with it.

Ron
Re: Please ID - Chromite? Chromiumite?
April 09, 2012 03:20PM
Claire, Check whether the colour looks different under tungsten filament (incandescent) light bulb, and under fluorescent tube lights. That's sometimes interesting for purple minerals coloured by chromium.
Re: Please ID - Chromite? Chromiumite?
April 10, 2012 08:00PM
    
looks like chromite with chromian clinochlore (form. kammererite)
Re: Please ID - Chromite? Chromiumite?
April 11, 2012 11:09AM
    
Also keep in mind that much (if not most) "Chromite" is actually not Chromite stricto sensu (i.e. Fe-dominant) but rather the Mg-dominant analogue Magnesiochromite. It is safer to label "Chromite-Magnesiochromite series".

Lefteris.
Re: Please ID - Chromite? Chromiumite?
April 11, 2012 06:41PM
Many thanks for the information :)

I have doen a bit of 'digging' - http://en.gtk.fi/ExplorationFinland/Moreinfo/kemi.html

Hope you can get into this site - interesting :) The rock is Chromitite
Re: Please ID - Chromite? Chromiumite?
April 11, 2012 07:39PM
    
Hello Claire
Magnesiochromite has not been found at Kemi. It is chromite (Hytönen, K. Suomen Mineraalit 1999). Chromitite is an error,
it should be chromite ore.

Ilkka
Re: Please ID - Chromite? Chromiumite?
April 12, 2012 06:06AM
    
"Chromitite" is a petrological term / rock name.
"Chromite ore" is a technical / mining term.
Franz Bernhard
avatar Re: Please ID - Chromite? Chromiumite?
April 13, 2012 05:03AM
Another reason to get our dictionary of mining, mineral and related terms running.

Rock Currier
Crystals not pistols.
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: July 30, 2015 01:08:50