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

Julgoldite

Posted by Rock Currier  
avatar Julgoldite
October 07, 2009 09:01PM
Click here to view Best Minerals J and here for Best Minerals A to Z and here for Fast Navigation of completed Best Minerals articles.


Can you help make this a better article? What good localities have we missed? Can you supply pictures of better specimens than those we show here? Can you give us more and better information about the specimens from these localities? Can you supply better geological or historical information on these localities? After each set of pictures there should be some descriptive text. If none appears it means that we need someone to tell us about the specimens from that locality and something about the geology of the occurrence.


Julgoldite-(Fe2+),-(Fe3+) & -(Mg) monoclinic
Ca2(Fe2+,Mg)(Fe3+,Al)2<(OH)2|SiO4|Si2O7> · H2OCa2(Fe3+,Mg)(Fe3+,Al)2<(OH,O)2|SiO4|Si2O7> · H2OCa2(Mg,Fe2+)(Fe3+,Al)2<(OH)2|SiO4|Si2O7> · H2O

Block Julgoldite-(Fe2+) with Calcite on Prehnite FOV 4mm.




JulgolditeNorwayMore og Romsdal, Norddal, Tafjord, Tafjord tunnel
Some fine Julgoldites were found at this locality associated with fine gem quality Datolite specimens.



Click here to view Best Minerals J and here for Best Minerals A to Z and here for Fast Navigation of completed Best Minerals articles.

Rock Currier
Crystals not pistols.



Edited 4 time(s). Last edit at 07/26/2010 10:27AM by Rock Currier.
avatar Re: Julgoldite
October 08, 2009 10:45PM
    
Julgoldite was found as small greenish black crystals mainly as inclusions in a second generation of clear calcite crystals, but also as inclusions in yellow datolite crystals from cavities encountered 1 km from the western entrance in the road tunnel from Fjøre to Tafjord during the construction in 1980 and 1981. Only a small number of such specimens were saved.


Crystals of Julgoldite included in a 1,5 cm crystal of calcite from the Tafjord tunnel, Møre og Romsdal, Norway.

Knut



Edited 1 time(s). Last edit at 10/08/2009 10:46PM by Knut Eldjarn.
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 1, 2015 15:33:38