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GeneralJunction Mine BH pyrosmalite

13th Jan 2018 22:42 UTCBen Grguric Expert

Massive, cleavable brown material identified as pyrosmalite was described from Browne's section on the 13 level of Junction mine at Broken Hill. Many tonnes of this material were present (an entire stope) and specimens were widely distributed. This material is discussed in both of the well-known Minerals of Broken Hill books, but I see in https://www.mindat.org/photo-754326.html that someone has determined this material to be rhodonite.

That someone doesn't seem to be traceable by me so I can't determine how the ID was confirmed etc. Does anyone know the up to date ID info on the 'pyrosmalite'?

13th Jan 2018 22:54 UTCUwe Kolitsch Manager

History log says:


"Message sent from: Ralph Bottrill

To: jkmelville@gmail.com

Date/Time (London UK Time): 12th Jun 2016 09:49


Dear James Melville,


Ref: http://www.mindat.org/picshow.php?id=754326


Thank you for uploading this photograph to mindat.org - as part of the

review process for photo submissions our editors have raised the

following issue(s) with this photograph that prevent us from approving

it:


* Your photo might not be the minerals you said it is



This one looks like rhodonite, pyrosmalite is pretty rare"

14th Jan 2018 01:41 UTCBen Grguric Expert

It is likely that Floss-Campbell and Maurice Mawby correctly identified this material as pyrosmalite before distributing it to museums worldwide. If that specimen is correctly located 13 Level, Browne's section, Junction mine the likelihood is that it contains pyrosmalite.

14th Jan 2018 14:17 UTCUwe Kolitsch Manager

Changed back to pyrosmalite-(Fe).

15th Jan 2018 22:20 UTCRalph S Bottrill 🌟 Manager

I’m certainly not convinced on this one either way, I just posed the question and James changed the name; I will ask if he can show me the specimen in person sometime.

Also all BH pyrosmalite specimens in Mindat seem to be variably classified as pyrosmalite-(Mn) or pyrosmalite-(Fe) and as most are intermediate and few of these have been analysed I wonder if many of these should be classified under the series rather than the specific species?

16th Jan 2018 00:36 UTCBen Grguric Expert

The pinkish crystalline material in the top half of the specimen looks like rhodonite, but the brownish lamellar-looking material at the bottom of the specimen does resemble my piece of pyrosmalite from the 13 level, so it could contain two species. From memory the 13 level material was described as pyrosmalite-(Fe) but I'll have to check.

16th Jan 2018 10:58 UTCBen Grguric Expert

According to Birch ed. (1999) Minerals of Broken Hill, the 13 level material was ferropyrosmalite i.e. pyrosmalite-(Fe). I've uploaded an example of this material.

16th Jan 2018 12:08 UTCRalph S Bottrill 🌟 Manager

Thanks Ben, good one, yes reviewing the original photo I’m pretty sure it’s a mixture, I will let James know.

16th Jan 2018 12:38 UTCRalph S Bottrill 🌟 Manager

Curiously that photo has lost its attribution to James Melville and is now shown as listed by Mindat.org! A bug?

16th Jan 2018 13:10 UTCDavid Von Bargen Manager

No, that sometimes is picked when someone wants to delete a photo.

16th Jan 2018 20:29 UTCRalph S Bottrill 🌟 Manager

Yes, I just checked with James and he decided to turn all his non-Tasmanian images over to Mindat, to focus on Tasmania. Unfortunate as we lose the link if we have issues.
 
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