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Mineralogical Classificationlepidomelane

4th Apr 2005 19:20 UTCAlfredo

Any "lepidomelane" entry automatically gets converted to "tetra-ferri-annite". Is this correct for all "lepidomelane' occurences? Perhaps it was so somewhere, but it might be overreaching to assume this is true elsewhere.

4th Apr 2005 20:03 UTCPeter A

Hi Alfredo,



Lepidomelane was (is) commonly used on the mica occuring in the nepheline-syenite pegmatites in Langesundsfjord/Larvik area, and as far as i know most of this mica is annite. Also the homepage of Alf Olav Larsen ( http://home.c2i.net/aolarsen/ ) does only list annite as occuring here, and he is one of the true experts of this area.

So i would conclude that lepidomelane should be regarded as a synonym of iron-rich biotite group minerals.



Regards

Peter A

4th Apr 2005 20:21 UTCDavid Von Bargen

de Fourestier in "Glossary of Mineral Synonyms" lists lepidomelane as annite, siderophyllite, tetra-ferri-anninite. (also a secondary name for lepidomelan - bobierrite). Bayliss has a similar list.

4th Apr 2005 21:30 UTCAlfredo

Thanks, Peter and David. We must change the Mindat Lepidomelane entry so that it does not automatically assume the species tetra-ferri-annite.

4th Apr 2005 21:35 UTCDavid Von Bargen

The closest thing to change it to might be a mixture, but maybe we need a new mineral classification.

26th May 2005 17:42 UTCAlfredo

Doesn't the word "mixture" imply two or more different phases are present? (otherwise there's no difference in meaning between "mixture" and "solid solution")

26th May 2005 20:03 UTCE.A.J. Burke

Dear all,



The IMA-CNMMN, in its continuing care for nomenclature, has published in 1998 a nomenclature report on the mica minerals; it can be consulted on the IMA-CNMMN website.

In the report, the name 'lepidomelane' has been discredited. The name 'lepidomelane' has been used for several micas, namely for annite, siderophyllite, tetra-ferri-annite and biotite (the latter being a series name for annite, phlogopite and siderophyllite).

It is not a good idea to change 'lepidomelane' automatically in another name, as the same name has been used for different minerals in the past. One needs analyses to know what is being meant. Petrologists should be more careful in their use of mineral names, but what can one do?
 
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