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Sodalite Group, Pyroxene Group : ADSi2O6, Apatite : Ca5(PO4)3(Cl/F/OH)

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Summary of all keyboard shortcuts

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Copyright © neschen
 
 
 
 
minID: 8TK-NQP

Sodalite Group, Pyroxene Group : ADSi2O6, Apatite : Ca5(PO4)3(Cl/F/OH)

Copyright © neschen  - This image is copyrighted. Unauthorized reproduction prohibited.
Field of View: 3 mm

Bluish prisms of a member of the sodalite group (visually identified).
peter neschen collection (g-05268_02)

This photo has been shown 319 times
Photo added:12th Apr 2014
Dimensions:4785x3190px (15.26 megapixels)
Camera:NIKON D7000

Data Identifiers

Mindat Photo ID:606307 📋 (quote this with any query about this photo)
Long-form Identifier:mindat:1:4:606307:5 📋
GUID:8713c9d9-05ec-40c8-b836-3bce32347fd7 📋
Specimen MinID8TK-NQP (note: this is not unique to this photo, it is unique to the specimen)

Discuss this Photo

PhotosSodalite Group - Stradner Kogel, Wilhelmsdorf, Bad Gleichenberg, Styria, Austria

12th Jan 2019 16:08 UTCTony Peterson Expert

Of course sodalite doesn't crystallize with this habit......these are likely pseudomorphs after nepheline.

12th Jan 2019 20:17 UTCGuenter Blass

03563620015669490811970.jpg
Hi Tony,


this habitus of sodalite (long prismatic) is known from the "Wannenköpfe" in the Vulkaneifel, Germany.



Günter Blass

13th Jan 2019 09:29 UTCAntonio Borrelli Expert

Distorted and elongated dodecahedral crystals of sodalite are fairly common with this habitus also in the volcanic areas of Latium, in Italy.

https://www.mindat.org/photo-292318.html

13th Jan 2019 12:03 UTCChristian Auer 🌟 Expert

Im no expert on this one but Mr.Trattner (trattnerite https://www.mindat.org/photo-316535.html) is and he always spoke of sodalite when he finds such blue xtls.

13th Jan 2019 19:56 UTCFrank K. Mazdab 🌟 Manager

I know external morphology can appear misleading sometimes (who would look at chalcotrichite for the first time and assume it's isometric?), but I'm still curious if from among these various sodalite examples mentioned above any have been identified by a means other than "visually identified"? I recall the sodalite-group mineral lazurite (or whatever lazurite is these days) reportedly has a non-isometric dimorph/polytypes... even if the composition were verified, could an unexpected polytypism/dimorphism still be the case in some of these examples?


NOTE: in refreshing my familiarity with lazurite for this post, I noticed the first vladimirivanovite link on the lazurite page (last sentence in the "about lazurite" section) is a dead link (because it's spelled wrong). It needs to be updated to https://www.mindat.org/min-41155.html

13th Jan 2019 21:32 UTCRalph S Bottrill 🌟 Manager

Yes it needs both XRD and a chemical analysis. It doesn’t really look like a pseudo morph ( usually fine grained). It may be hauyne which can also be prismatic, eg. https://www.mindat.org/photo-482830.html, and of course lazurite may just be a variety of hauyne. Lazurite can have orthorhombic, monoclinic and triclinic polytypes and sodalite, being isostructural, possibly could also, and may relate to the odd morphology? There is an unnamed triclinic “polymorph” of lazurite, possibly just the triclinic polytype?


I fixed the typo, but the nomenclature is a mess, as indicated above. Also it seems vladimirivanovite should probably be a polytype of hauyne, not a distinct species. I’m not sure Tsaregorodtsevite https://www.mindat.org/min-4034.html really belongs in this group if the given formula is correct? Curiously no polytypes are indicated for hauyne, all are referred to lazurite. Maybe hauyne should be renamed lazurite, though the former name has precedence.

14th Jan 2019 20:03 UTCGuenter Blass

Hi Ralph and Frank,

The sodalithe minerals of the Volcanic Eifel shown above are all XRD and EDS analysed!!

They were analyzed to distinguish them from Nosean/Hauyn.


Günter Blass

16th Jan 2019 12:52 UTCRalph S Bottrill 🌟 Manager

Günter, good to know, thanks.

Not sure if this applies to the Austrian material?

16th Jan 2019 14:51 UTCUwe Kolitsch Manager

The Austrian localities, although individually different, are all quite similar to the German ones.

16th Jan 2019 18:49 UTCGuenter Blass

Hi Ralph

I'm not sure!

But the Morphology of the Cristalls is typical on some German & Austrian sites.

Günter
 
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