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PhotosPentlandite - Sudbury District, Ontario, Canada

28th Jan 2013 05:44 UTCTim Jokela Jr

Skutterudite, Nickeline

Sudbury District, Ontario, Canada

Quite the odd color for pentlandite.

28th Jan 2013 07:37 UTCDan R. Lynch

I agree. But what do you think it might be instead? And it is also possible that the color of this photo is off. If you look at the details, a few areas do seem to have just a hint of brown/brassy coloration. Metallic minerals can be frustrating to photograph, so maybe that's part of the issue.

28th Jan 2013 08:37 UTCAlfredo Petrov Manager

Another issue is that computer screens aren't standardised and neither are digital cameras. I look at Mindat photos on two different computers and see two different colours. One just can't trust colour tints on the screen, so we can't use that as the primary criterion for deciding if an identification is wrong.

28th Jan 2013 10:02 UTCCourtenay Smale

Kaolinite after orthoclase - incorrect locality. Slip China Stone Quarry.

Two images of kaolinite after orthoclase - ID 302068 and ID 258592 are accredited as having originated from Slip China Stone Quarry, St. Dennis, St. Austell, Cornwall, England. UK.

Slip China Stone Quarry lies in the heart of the non-megacrystic portion of the St. Austell Granite Mass where no megacrysts occur. The kaolin pseudomorphs came from either the megacrystic granite in the western lobe of the St. Austell Granite Mass or the eastern portion of that granite mass.

There are a number of china clay pits from which the specimens could have originated. To be on the safe side, I suggest that the origin of the specimens be revised to 'St. Austell, Cornwall, England. UK.'

Courtenay Smale

28th Jan 2013 15:42 UTCTim Jokela Jr

I dunno Alfredo.

Monitor calibration is over-rated. Necessary for pro photogs, yes, for the masses, no.

Camera, monitor, whatever you want to call it, pentlandite doesn't come in that color.

So don't show it in that color.

Sure metallic minerals are hard to photograph... don't care.

Ignore the problem and lose credibility.

When in doubt... delete.

Or say yes to pink wulfenites and purple malachites...?

28th Jan 2013 18:57 UTCDan R. Lynch

Monitor calibration IS over-rated, I agree. And I also agree that the specimen certainly doesn't look like pentlandite - I was just playing devil's advocate. The fact of the matter is that the photo doesn't appear to be pentlandite as it currently is, so it shouldn't be in the public photo gallery.

But wouldn't a pink wulfenite be cool?

28th Jan 2013 20:09 UTCRob Woodside 🌟 Manager

Thanks Tim. Where's the parting in this "pentlandite". This is an arsenide from cobalt/gowganda. Notice the bronze niccolite bit in the upper right. The colour is fine. Message sent.

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