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Improving Mindat.orgmangan-neptunite

15th May 2005 22:02 UTCDoug Merson

The entry for mangan-neptunite under the Poudrette quarry indicates it is not a vakid mineral while the main mineral listing indicates it is a valid mineral. A reference for the occurance at the Poudrette Quarry is Mineral Record 21:321 (1990).

Doug Merson

16th May 2005 13:56 UTCKrister

The first description seems to be from Lovozero Massif:

American Mineralogist (1927) Volume 12, pp. 96



Don't know if it has lost its status since.

16th May 2005 15:21 UTCJim Ferraiolo

It's still valid. Mangan-neptunite is in quotes in the Poudrette Quarry locality listing. The quotes should be removed. Also, Charmarite is shown with two polytype listed as varieties and in bold.

16th May 2005 22:21 UTClaszlo

I already raised the mangan-neptunite issue about two years ago along with fluorbritholite-(Ce) and normandite, but they are still listed as not valid. MSH is the TL for the last two species.

Ferro-eckermannite and ferronyböite are also valid (Mandarino & Back 2004).

I propose to remove tadzhikite-(Y), gmelinite ser. (so far all gmelinites are gmelinite-Na) and under quartz, remove var. sceptre quartz from the Mont St-Hilaire list. Sceptre quartz is a habit not a variety of quartz.

Hiortdahlite is also listed as not valid, perhaps hiortdahlite grp. or ser. may be in order as it is not known which of the hiortdahlites we have (-I or -II).

László

16th May 2005 22:30 UTClaszlo

One more mineral to remove from the MSH list: hydrotalcite. The former MSH hydrotalcite is quintinite.

László

17th May 2005 00:09 UTCPeter A

Hi László,



as far as i know hiortdahlite - I and -II are regarded the same mineral but polytypes. So hiortdalite should stand alone as the valid, and both "-I" and "-II" regarded as synonyms, as the database works now.



Regards

Peter A

19th May 2005 13:54 UTClaszlo

Hi Peter,



Mandarino & Back (2004) treat hiortdahlite I & II as separate species, Anthony et al. (Handbook) as single species (with I & II as topological variants) and the IMA official list gives hiortdahlite I (status R) and hiortdahlite II as a polymorph (status P in the MDI database). A bit confusing to say the least.



Regards

László
 
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