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Improving Mindat.orgTirodite from Talcville, NY

17th Dec 2010 19:03 UTCJohn Betts

In 1961 a find of an unknown mineral at International Talc Company mine, Talcville, NY was labeled as Tirodite. A specimen of the material is illustrated on Mindat at http://www.mindat.org/photo-278693.html

Tirodite was identified on Mindat as Parvowinchite based on the assumption that Tirodite was a synonym of Parvowinchite as described in the 1997 paper on amphibole nomenclature.

But a recent email from Mike Hawkins, curator at the NY State Museum mineral collection states, "The material that we have examined from Talcville called tirodite has been shown to be mangano cummingtonite by electron microprobe."

Most likely the renaming of Tirodite as Parvowinchite is correct, but that the material from this locality is actually a different mineral.

This suggests:

1. The photo be corrected on Mindat (http://www.mindat.org/photo-278693.html).

2. The questionable manganocummingtonite listing on the locality page (http://www.mindat.org/loc-158617.html) be revised to be a valid species.

3. Parvowinchite should be removed from the locaity page (http://www.mindat.org/loc-158617.html).

17th Dec 2010 22:09 UTCJolyon Ralph Founder

Seeing as another great amphibole shakeup is imminent, I would wait until that is published before we make any changes.

Jolyon

17th Dec 2010 22:32 UTCJohn Duck

Just to clarify manganocummingtonite, parvowinchite, and tirodite all refer to the same mineral. See Mindat under parvowinchite and webmineral.com under manganocummingtonite.

17th Dec 2010 22:42 UTCKnut Edvard Larsen 🌟 Manager

Thanks for spotting this, John.

Since there is already a reference given for parvowinchite at the Talcville locality page, i like to check out this reference first before removing or doing things.

The reference listed is:

George Robinson & Steven Chamberlain (2007) Gazetteer of major New York State mineral localities. Rocks & Minerals, 82, #6, 472-483

I don't have access to this issue. Does it refers to the "tirodite" or is it about another mineral found at the locality ?

Tirodite was identified on Mindat as Parvowinchite based on the assumption that Tirodite was a synonym of Parvowinchite as described in the 1997 paper on amphibole nomenclature

If you refer to Leake (1997) , it is saying that tirodite = manganocummingtonite http://www.minsocam.org/msa/ima/ima98(11).pdf

Descrption of "tirodite", Segeler (1961) can be read here: http://www.minsocam.org/ammin/AM46/AM46_637.pdf.

17th Dec 2010 23:42 UTCJohn Duck

Knut,

Unfortunately I do not have a copy of the referenced Rocks and Minerals Issue. So I can't be much help there. I have no problem editing the mineral names on my photos, but please edit the site info first so the photos will be consistent. Leake (1997) does state that tirodite = manganocummingtonite. One thing to check though is the reference to IMA 2003 nomenclature changes/species discreditation referenced on Webmineral.com and /or Mindat. Were there further nomenclature changes in 2003? Does this mean that the Mindat parvowinchite entry needs to be changed then to manganocummingtonite?

18th Dec 2010 20:30 UTCKnut Edvard Larsen 🌟 Manager

The IMA new minerals 2003 : http://www.minsocam.org/msa/ammin/toc/Abstracts/2004_Abstracts/Oct04_Abstracts/Burke_p1566_04.pdf

says about IMA 2003-066 = parvowinchite the following:

" Similar amphibole material has been previously described as “tirodite”, but this name was discredited in the 1997 paper on amphibole nomenclature, the new name being “(alkali-bearing) manganocummingtonite”.

(cfr Parvowinchite page : http://www.mindat.org/min-25680.html )

If the "similar amphibole materiale" (from Talcville) now is again found to be manganocummingtonite, i really agree with Jolyon that to wait until new nomenclature on the amphibole is published is the absolute best in this case.

18th Dec 2010 23:39 UTCJohn Duck

I completely agree.

19th Dec 2010 19:10 UTCJohn Betts

John Duck Wrote:

-------------------------------------------------------

> Just to clarify manganocummingtonite,

> parvowinchite, and tirodite all refer to the same

> mineral. See Mindat under parvowinchite and

> webmineral.com under manganocummingtonite.

John,

That is incorrect. Manganocummingtonite and parvowinchite are distinct species.

19th Dec 2010 19:36 UTCJohn Betts

Since Hawkins at the NY State Museum has confirmed manganocummingtonite, the question mark following the species should be eliminated for the locality (http://www.mindat.org/loc-158617.html).

19th Dec 2010 22:05 UTCUwe Kolitsch Manager

Done.

20th Mar 2012 19:24 UTCOlav Revheim Manager

I'd like to support John Betts on this one because of the following information:

"Segeler (1961) mistakenly referred to the manganoan cummingtonites from Talcville, New York as "tirodite," because the yellow amphibole from Tirodi contains substantial amounts of Mn and Mg. Unfortunately, Segeler's misidentification of manganoan cummingtonite as tirodite received the blessings of the IMA Commission on New Mineral Names. Ross et al. (1969) have recommended that the name tirodite should not be applied to the Talcville specimens, which they prefer to call manganoan cummingtonite." Subrata Ghose, Yang Hexiong (1989): Mn-Mg distribution in a CZ/m manganoan cummingtonite: Crystal-chemical considerations, American Mineralogist, Volume 74, pages 1091-1096, 1989:

Further, Deer, Howie and Zussman (Rock forming minerals, double chain silicates, p96) provides an analysis of "tirodite" from Talcville NY, showing 0,033 apfu Al, and 0.059 apfu Na, thus far from any winchite-series mineral.

The original paper published by Segler in 1961: Segler(1961): FIRST U. S. OCCURRENCE OF MANGANOAN

CUMMINGTONITE, TIRODITE, also contains two analysis' of the "tirodite". None of them contain any Na.

Even if it is possible that the entire winchite-series will be discontinued in the future, cummingtonite will probably not disappear.

I think it is safe to delete parvowinchite from the Talcville locality page.

Calling tirodite a synonym of parowinchite, see tirodite page is also incorrect. Most "tirodites" qualify as Mn-rich cummingtonites or manganocummingtonites in todays nomenclature.

Olav

26th Mar 2012 19:40 UTCKnut Edvard Larsen 🌟 Manager

Commentaries added to the tirodite page http://www.mindat.org/min-3975.html, International Talc Company Mine page http://www.mindat.org/loc-158617.html,

and parvowinchite set as "erronously reported" (with commentaries) on the locality page.

Messages sent for the photos

21st Apr 2012 19:40 UTCJohn Duck

To solve this dilemma I sent a sample of the specimen to John Attard for analysis. Results of the analysis indicate that the specimen is in fact anthophyllite, not parvowinchite or manganocummingtonite. Accordingly it appears that short of an analysis, identification cannot be made with certainty on this material.

I have updated the two photos under International Talc Company mine (Reynolds mine), Talcville, St. Lawrence Co., New York, USA. Unfortunately one of the updated photos is not appearing for the site. Could someone refresh the page or approve the edits?

22nd Apr 2012 07:04 UTCOlav Revheim Manager

John,

Thanks. According to Segeler(1961), his "tirodite", ie Mn-rich cummingtonite was found as "transparent pink blades embedded in a matrix of fibrous pink anthophyllite". You may have both anthophyllite, cummingtonite and tremolite in the same specimen.

:-)

Olav

22nd Apr 2012 13:35 UTCJohn Duck

Olav,

It's possible, but the sample submitted for analysis consisted of semi-transparent pink blades originally embedded in a tremolite matrix. So the "transparent pink blades" may be either anthophyllite or manganocummingtonite, etc.

John

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