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LocalitiesWiperaminga Hill (McMahon's Pegmatite; McMahon Quarry; Wiperaminga East; MC 2464; McMahon Feldspar Pty. Ltd; ML 4536), Boolcoomatta Reserve (Boolcoomata Station), Olary Province, South Australia, Australia

7th Jul 2012 02:06 UTCSteve Stuart Expert

I purchased a thumbnail specimen of "niobian-ilmenorutile" attributed to:

"Wiperaminga Hill

East Quarry, Olany

Province, South

Australia, Australia"

My Mindat research gives the McMahon's Pegmatite (McMahon quarry) as the closest match to the label. There is a "West Quarry" with a different suite of minerals. My questions are:

Is the East Quarry the same locality as the McMahon's Pegmatite?

Is ilmenorutile known to be found in this pegmatite?

Here is a photo-

Thanks,

Steve Stuart

7th Jul 2012 03:45 UTCAlfredo Petrov Manager

I can't answer your question, Steve, but just couldn't resist commenting that all ilmenorutile has niobium, by definition (as I'm sure you knew, but the seller didn't) . So selling "niobian ilmenorutile" is a bit like selling "sweet honey" and "sour lemons" :-)

8th Jul 2012 01:31 UTCSteve Stuart Expert

The formula for ilmenorutile on Mindat also has tantalum. One idea I have is that the person who IDed the crystal did it with EDS and found dominant niobium. The seller was John Ebner at the 2012 Rochester Symposium. I'm not convinced that he was also the original collector.

8th Jul 2012 02:31 UTCSteve Stuart Expert

I trimmed my specimen to fit a European-style micromount box by splitting off the base of the milky quartz on which the crystal sat, thus shortening the rock to fit. The fragments that split off contained these black minerals, perhaps of the same species. All my images are about 2 mm in length FOV.

10th Jul 2012 09:22 UTCMark Willoughby Expert

Howdy Steve,

I did a little digging around and have found it is the same location; SARIG now has it listed in the database. Until now I had been unable to find it in the database and had to rely solely on historic Mines Summary Cards for information. I have updated the page to show all the names currently known. If I find any more I will add them as I find them.

*Follow-up* As yet I have not been able to confirm the ilmenorutile, however, I am awaitting a reply to the question and will post as soon as I find out.

10th Jul 2012 13:23 UTCBen Grguric Expert

Steve,

Ilmenorutile is relatively common in the various pegmatites scattered throughout the Curnamona province. I collected a 3cm crystal near the Ethiudna mine on Plumbago Station in 1992. Didn't properly characterise it until a couple of years ago. There are several localities listed in the Catalogue of SA Minerals and in the Campana and King 1950's bulletin on the Olary Province.

Regards,

Ben.

10th Jul 2012 13:56 UTCMark Willoughby Expert

Ben,

Have you by any chance collected any at this location? I was just talking to Don McColl and he cannot recall any at the quarry, only as you noted that it is common throughout the region.

We cannot add it to the database unless we can confirm it!

Steve,

Are you able to have your specimens tested to confirm the species?

11th Jul 2012 00:44 UTCSteve Stuart Expert

Bookmarked the SARIG database and also found the East (McMahon) locality. Should the Mindat title be changed to include reference to the East quarry? I am hoping to get some EDS analysis in the next few weeks.

Steve

11th Jul 2012 06:27 UTCBen Grguric Expert

Hi Mark,

No haven't collected personally at Wiperaminga, so can't confirm the occurence there. We should add the additional known localites from Campana and King etc. Will look into it.

Regards,

Ben.

11th Jul 2012 09:46 UTCMark Willoughby Expert

Howdy Ben,

I've already updated the name on the site; there is, however, a lot of work to still be done on the Olary Province area. I've been working mainly on the Fleurieu Peninsula and Flinders Ranges lately, so if you wish to help out, go for it! I'm the only person working on South Australian listings regularly. There is a couple of people adding here and there, but not on any regular basis, so help out all you want.

SARIG are now adding a lot of the Mines Summary Records to the database as well, you'll find they often have info that's not in the SARIG details or anywhere else.

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