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Julgoldite

Posted by Rock Currier  
avatar Julgoldite
October 07, 2009 08:01PM
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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] · H2O
Ca2(Fe3+,Mg)(Fe3+,Al)2[(OH,O)2|SiO4|Si2O7] · H2O
Ca2(Mg,Fe2+)(Fe3+,Al)2[(OH)2|SiO4|Si2O7] · H2O

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



Julgoldite
Norway
More 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 09:27AM by Rock Currier.
avatar Re: Julgoldite
October 08, 2009 09:45PM
    
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.
© Knut Eldjarn

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 09:46PM by Knut Eldjarn.
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