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Baghdadite : Ca3(Zr,Ti)(Si2O7)O2, Perovskite : CaTiO3

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Copyright © Knut Eldjarn
 
 
minID: DMC-VQF

Baghdadite : Ca3(Zr,Ti)(Si2O7)O2, Perovskite : CaTiO3

Copyright © Knut Eldjarn  - This image is copyrighted. Unauthorized reproduction prohibited.
Field of View: 15 mm

A 1 cm aggregate of prismatic, beige crystals of Baghdadite in the center of the photo with a black crystal of Perovskite to the right in a matrix of greiysh-white calcite from the Fuka mine, Okayama, Japan. Specimen and photo: Knut Eldjarn.

This Photo was Mindat.org Photo of the Day - 11th Dec 2014

This photo has been shown 2501 times
Photo added:10th Feb 2007
Dimensions:709x531px (0.38 megapixels)
View Knut Eldjarn's Photos View Baghdadite Gallery

Discuss this Photo

PhotosBaghdadite - Fuka mine, Fuka, Bicchu-cho, Takahashi City, Okayama Prefecture, Chugoku Region, Honshu Island, Japan

20th Nov 2014 09:49 GMTDavid Parfitt

I am not totally clear which is the baghdadite on this specimen. Mindat lists baghdadite as colourless, while the Japanese paper that describes it from the Fuka mine calls it greyish white. There is plenty of greyish white material visible on the photo, but I am assuming from the way the photo has been taken, that the baghdadite is the brownish mineral visible at the centre and left and the grey is the matrix mentioned in the caption? I understand that the photo may not have reproduced the actual colour of the baghdadite well, or that there could be inclusions or a coating that make it look different, but I think there should be some more explanation in the caption so that it is 100% clear what we are looking at and how/why it differs from the material described in the paper (if indeed it does).


David

20th Nov 2014 11:21 GMTAlfredo Petrov Manager

We've seen several discussions on Mindat in recent years about minerals differing in colour from their published descriptions. I'm reminded of my first mineralogy prof who used to say, "Color is the least reliable mineral identification tool". What generally happens is that the colour noted on the Mindat species page is taken from the first published reference, and then other colours are found by collectors later but don't get published in the literature. I doubt that many journal editors would even agree to publish a paper if the primary finding was just that a new colour shade had been found.


Specifically regarding the Fuka baghdadites, the first ones found were almost colourless, tiny, and hard to see at all without the help of their brilliant fluorescence under UV light to distinguish them from their matrix. In later years larger ones were found with more colour - pale brown, beige, or pale yellowish. In part this increased colour may just be due to the increased size; hard to see pale colours in very tiny transparent or translucent grains.

20th Nov 2014 12:57 GMTDavid Parfitt

Thanks for the detailed info Alfredo. I don't have a problem with the colour being different from the published description, but I do think the photo caption needs changing, as well as the colour section on the baghdadite page to incorporate the info you provided.

1st Dec 2014 21:47 GMTDavid Parfitt

Photo caption still says "greyish crystals of Baghdadite"...

1st Dec 2014 23:47 GMTAlfredo Petrov Manager

Photographer has amended the caption.

2nd Dec 2014 10:56 GMTDavid Parfitt

(tu)
 
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