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Mineralogical ClassificationAlumino-ferrobarroisite

22nd Feb 2012 19:48 UTCJordi Lluis Justo del Campo

http://www.mindat.org/min-1508.html

Alumino-ferrobarroisite is an hypothetical Amphibole species: name and ideal formula approved by the IMA, but has not been found in nature yet.

How is it possible that IMA approved a mineral that not exists in nature?

If I'm not wrong anyone by this rule may file a new mineral?

22nd Feb 2012 20:25 UTCReiner Mielke Expert

Now that is what I call being proactive.

23rd Feb 2012 19:17 UTCUwe Kolitsch Manager

You might want to read

http://pubsites.uws.edu.au/ima-cnmnc/amphiboles2003.pdf (IMA Report),

http://pubsites.uws.edu.au/ima-cnmnc/namedamphiboles.pdf (IMA Report) and

http://pubsites.uws.edu.au/ima-cnmnc/amphiboleclassification.pdf (Discussion paper initiated by the IMA-CNMNC).

and then argue with the respective authors.

23rd Feb 2012 21:32 UTCJordi Lluis Justo del Campo

That might have scientific and technical reasons, but they are understandable to me as a profane public.

5th Mar 2012 18:49 UTCStefan Schorn

Or maybe read this report where the name was published
Canadian Mineralogist 35 (1997)

6th Mar 2012 11:47 UTCBela Feher Expert

Or see the earlier discussion in similar topic:

http://www.mindat.org/forum.php?read,14,112462,112462#msg-112462

6th Mar 2012 14:32 UTCBart Cannon

I am very interested in ferrobaroissite.

Skagit County of Washington State has a cluster of Jurassic eclogites and ferrobarrosite is common in some portions of that eclogite.

My EDS analyses show important aluminum in the ferrobarrorisite.

Late stage veinlets in the ferrobarroisite schists show very attractive emerald green druses of what has tentatively been identified as omphacite. I think they look more like an amphibole rather than a pyroxene, but analyses at RUFF differ from my opinion.

I will provide this material free of charge to any competent lab. And ANYONE who wants a sliver of the purported ferrobarroistite schist may have a TN for $1.50 postage.

Most of the original work on this area was conducted by the geology staff at Western Washington State University. Ed Brown might have been the team leader.

See GSA "Geologic Map of the Northwest Cascades, Washington" Map and Chart Series MC-61. published by the GSA in 1987.

If anyone has a confirmed ferrobarroisite, I would very much like to obtain a small piece.

Bart

6th Mar 2012 17:33 UTCReiner Mielke Expert

How much would it cost to positively identify an amphibole these days?

6th Mar 2012 21:24 UTCBart Cannon

Reiner,

The best analyses are free and conducted by interested specialists !

I can't compete on quality or cost at my lab.

Bart

7th Mar 2012 00:05 UTCD Mike Reinke

Bart

I'm interested in a sliver or two. One for a friend of mine who isn't the amphibolic I am. (i'm not THAT much of one anyway, I won't probably get that deep into the chemistry of it.) How do I contact you other than here?

Mike

7th Mar 2012 00:25 UTCReiner Mielke Expert

let me know how that works out for you.

7th Mar 2012 12:29 UTCBart Cannon

Anyone who wants a small piece of Skagit County ferrobarroisite schist can have one for the cost of postage.

Just put some stamps in an envelope.

The ferrobarrosite schist has to be one of the toughest rocks on Earth and it breaks with sharp edges..

If our early indians knew where the eclogites were out here, they would have had a top product for hammers, scrapers and spear points.

There is an excellent thesis at the University of Washington by the late Ed Baker. He determined that by as long ago as 9,000 bp there were five quarries in the Northwest from which came most of the toolmaking materials. The indians didn't just casually pick up tool making rough willy-nilly.

They insisted upon the very tough and workable vitrophyric dacites from specific locations between British Columbia and SE Washington State.

I needed to use a "Microblaster" to break up my ferrobarroisite schist boulder. A 4 pound sledge just makes the stuff laugh.

Bart Cannon

1041 NE 100th Street

Seattle, WA 98125

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