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Kafehydrocyanite
Valid as an unnamed mineral
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About Kafehydrocyanite
Formula:
K4[Fe(CN)6] · H2O
Colour:
Yellow, yellow-green, blue-green, white
Hardness:
2 - 2½
Crystal System:
Tetragonal
First Recorded Locality:
Potassium hexacyanoferrate(II) hydrate - a complex salt.
Originally reported from Medvezhii Log Au Deposit, Ol'khovskoye ore field, Sayan Mts, Tuva Republic, Eastern-Siberian Region, Russia.
Possibly originated due to cyanide leaching. Doubtful as a natural mineral.
See also: UM2009-//-CN:FeHKZn
Originally reported from Medvezhii Log Au Deposit, Ol'khovskoye ore field, Sayan Mts, Tuva Republic, Eastern-Siberian Region, Russia.
Possibly originated due to cyanide leaching. Doubtful as a natural mineral.
See also: UM2009-//-CN:FeHKZn
Unique Identifiers
Mindat ID:
2130
Long-form identifier:
mindat:1:1:2130:8
IMA Classification of Kafehydrocyanite
IMA status notes:
Published without approval, Unnamed (probably valid)
Classification of Kafehydrocyanite
10.AD.10
10 : ORGANIC COMPOUNDS
A : Salts of organic acids
D : Cyanates
10 : ORGANIC COMPOUNDS
A : Salts of organic acids
D : Cyanates
50.2.5.1
50 : ORGANIC COMPOUNDS
2 : Mellitates, Citrates, Cyanates, Acetates and Formates
50 : ORGANIC COMPOUNDS
2 : Mellitates, Citrates, Cyanates, Acetates and Formates
30.2
30 : Thiocyanates
30 : Thiocyanates
Physical Properties of Kafehydrocyanite
Colour:
Yellow, yellow-green, blue-green, white
Hardness:
2 - 2½ on Mohs scale
Optical Data of Kafehydrocyanite
Type:
Uniaxial (+)
RI values:
nω = 1.577 nε = 1.584
Max. Birefringence:
δ = 0.007
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized uniaxial interference figure - the conoscopic
(convergent-light, Bertrand-lens-in) view, for a grain cut with the optic axis
centred and vertical. The coloured rings are isochromatics, computed with the
same physics as the Michel-Lévy bar above; the dark cross is the isogyre.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
Chemistry of Kafehydrocyanite
Mindat Formula:
K4[Fe(CN)6] · H2O
Element Weights:
Crystallography of Kafehydrocyanite
Crystal System:
Tetragonal
First Recorded Occurrence of Kafehydrocyanite
Other Language Names for Kafehydrocyanite
German:Kafehydrocyanit
Spanish:Kafehydrocyanita
Related Minerals - Strunz-mindat Grouping
| 10.AD.05 | Julienite | Na2[Co(SCN)4] · 8H2O |
Radioactivity
Other Information
Health Risks:
When heated with mineral acids, hexacyanoferrates will liberate prussic acid, HCN (gaseous), which is extremely toxic even at low levels. Contact with acids, therefore, should be prevented at all events.
Internet Links for Kafehydrocyanite
mindat.org URL:
https://www.mindat.org/min-2130.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Kafehydrocyanite
Localities for Kafehydrocyanite
Showing 4 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Russia | |
| Pekov (1998) |
| Pekov (1998) | |
| Pekov (1998) |
| - (1974) +1 other reference |
Medvezhii Log Au deposit, Ol'khovskoye ore field, Tuva, Russia