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Improving Mindat.orgColour info for Kafehydrocyanite page
1st Jun 2026 23:53 UTCYash Redkar OP
https://www.mindat.org/min-2130.html
The colour is listed as yellow but clearly white and colourless examples exist, as highlighted by photos, so those should be added to the colour list. Thanks!
2nd Jun 2026 00:36 UTCKeith Compton 🌟 Manager
Well it's not an IMA approved mineral.
Webmineral indicates that the colour is yellow, pale yellow green.
The photo shown in wikipedia is clear to yellow almost brown !
Fleisher reported in "New Minerals Names" - American Mineralogist that the colour was "lemon-yellow, paler when partly dehydrated".
So it would appear that if the material in mindat's photo is correctly Id'd then the crystals are dehydrated to some extent. Does that then give rise to a different colour? Perhaps not.
2nd Jun 2026 05:29 UTCDalibor Matýsek
Potassium ferrocyanide (also called yellow blood salt) is a common chemical and is always yellow in the bottle. Since it is a relatively non-toxic complex cyanide salt that crystallizes nicely and forms colored complexes with many ions in solutions, it is a good choice for children's experiments. It is hard to tell what is in the attached pictures, maybe it is something else entirely.
2nd Jun 2026 05:54 UTCDalibor Matýsek
The bottles in the laboratory are labeled potassium hexacyanoferrate(II) trihydrate, syn: potassium ferrocyanide, yellow prussiate, so it contains crystal water and dehydration is possible. Cafehydrocyanite is not a valid mineral and its water content has probably not been seriously addressed by anyone.
2nd Jun 2026 06:19 UTCYash Redkar OP
Hi all,
Jeff Weissman also posted one, and I trust Jeff's experience and identification. It is also a white specimen. @Jeff Weissman
2nd Jun 2026 08:57 UTCKeith Compton 🌟 Manager
That also looks dehydrated
2nd Jun 2026 14:02 UTCJeff Weissman Expert
I believe the color balance is correct on all images of the kafehydrocyanite here on MinDat. It is slightly bluish white opaque colored. I have not seen artificial or fresh material for comparison.
2nd Jun 2026 10:13 UTCHerwig Pelckmans
Sorry to be a party crasher, but the mineral kafehydrocyanite is regarded as a valid mineral
(see second line of the mineral page).
(see second line of the mineral page).
At the same time it is called an un-named mineral and as such it can not be part of the IMA-list of approved minerals, simply because it was never sent to the IMA for approval.
So what should happen, is that a mineralogist does whatever is needed to make a full description for this mineral, and then send that to the IMA for approval. Then the mineral could be IMA approved and the name added to the IMA list.
For those who believe this mineral can not grow in natural conditions, see pages 107 & 108 of this book: https://www.mindat.org/reference.php?id=12916859
2nd Jun 2026 16:52 UTCUwe Kolitsch Manager
Povarennykh, A.S., Rusakova, L.D. (1973) The new mineral kafehydrocyanite. International Geology Review, 15 (9) 1095-1100 doi:10.1080/00206817309475990 (just added to the mineral page)
gives some more detailed info on the colour.
2nd Jun 2026 22:07 UTCRalph S Bottrill 🌟 Manager
Colour updated
2nd Jun 2026 22:15 UTCYash Redkar OP
Hi Ralph, I still only see yellow.
2nd Jun 2026 22:29 UTCRalph S Bottrill 🌟 Manager
It’s showing now
3rd Jun 2026 01:37 UTCYash Redkar OP
Indeed it is, thank you so much, Ralph!
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To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844. doi:10.2138/am-2024-9486.
隐私政策 - 条款和条款细则 - 联络我们 - Report a bug/vulnerability Current server date and time: 2026.6.4 05:27:06
To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844. doi:10.2138/am-2024-9486.
隐私政策 - 条款和条款细则 - 联络我们 - Report a bug/vulnerability Current server date and time: 2026.6.4 05:27:06