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Kafehydrocyanite

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Formula:
K
 
4
[Fe(CN)
 
6
] · H
 
2
O
System:TetragonalColour:Yellow
Hardness:2 - 2½


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.

Classification of Kafehydrocyanite

IMA status:Published without Approval 1974
Strunz 8th edition ID:9/A.02-40
Nickel-Strunz 10th (pending) edition ID:10.AD.10

10 : ORGANIC COMPOUNDS
A : Salts of organic acids
D : Cyanates
Dana 8th edition ID:50.2.5.1

50 : ORGANIC COMPOUNDS
2 : Mellitates, Citrates, Cyanates, Acetates and Formates
Hey's CIM Ref.:30.2

30 : Thiocyanates
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Physical Properties of Kafehydrocyanite

Colour:Yellow
Hardness (Mohs):2 - 2½

Crystallography of Kafehydrocyanite

Crystal System:Tetragonal

Optical Data of Kafehydrocyanite

Type:Uniaxial (+)
RI values: nω = 1.577 nε = 1.584
Maximum Birefringence:δ = 0.007

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate

Chemical Properties of Kafehydrocyanite

Formula:
K
 
4
[Fe(CN)
 
6
] · H
 
2
O
Simplified for copy/paste:K4[Fe(CN)6]·H2O
Essential elements:C, Fe, H, K, N, O
All elements listed in formula:C, Fe, H, K, N, O

Relationship of Kafehydrocyanite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
10.AD.05Julienite
Na
 
2
[Co(SCN)
 
4
] · 8H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
30.1Julienite
Na
 
2
[Co(SCN)
 
4
] · 8H
 
2
O

Other Names for Kafehydrocyanite

Other Languages:
German:Kafehydrocyanit
Spanish:Kafehydrocyanita

Other Information

Health Warning: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.

References for Kafehydrocyanite

Reference List:

- +
American Mineralogist (1974): 59: 209.

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  • Localities for Kafehydrocyanite

    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Russia
     
    • Eastern-Siberian Region
      • Transbaikalia (Zabaykalye)
        • Yeniseisk Autonomous Oblast'
          • Kuznetsk Alatau Range
    Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
    Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
      • Tuva Republic
        • Sayan Mts
          • Eastern Sayan
            • Ol'khovskoye ore field
    Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow; American Mineralogist 59:209
    • Urals Region
      • Southern Urals
        • Orenburgskaya Oblast'
          • Mednogorsk District
            • Sakmara Zone
    Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
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