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Kröhnkite

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Chuquicamata Mine, Calama, El Loa Province, Antofagasta Region, Chile
© Rob Lavinsky

Show Kröhnkite Photos (22)
Formula:
Na
 
2
Cu(SO
 
4
)
 
2
·2H
 
2
O
System:MonoclinicColour:Blue, greenish-blue; ...
Lustre:VitreousHardness:2½ - 3
Name:After B. Kröhnke, who first analyzed the mineral.
This page provides mineralogical data about Kröhnkite.

Classification of Kröhnkite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:6/C.16-10
Nickel-Strunz 10th (pending) edition ID:7.CC.30

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
C : Sulfates (selenates, etc.) without additional anions, with H2O
C : With medium-sized and large cations
Dana 8th edition ID:29.3.2.1

29 : HYDRATED ACID AND NORMAL SULFATES
3 : A2B(XO4)2·xH2O
Hey's CIM Ref.:25.2.11

25 : Sulphates
2 : Sulphates of Cu and Ag
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Type Occurrence of Kröhnkite

Type Locality:Chuquicamata Mine, Calama, El Loa Province, Antofagasta Region, Chile
Associated Minerals at type locality:
NatrochalciteChalcanthiteBlöditeAtacamiteAntlerite

Physical Properties of Kröhnkite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:Blue, greenish-blue; light blue to colourless in transmitted light
Streak:White
Hardness (Mohs):2½ - 3
Cleavage:Perfect
On {010} perfect; on {1¯01} very imperfect.
Fracture:Conchoidal
Density (measured):2.9 g/cm3
Density (calculated):2.95 g/cm3

Crystallography of Kröhnkite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/b (P1 1 21/b) [P21/c] {P1 21/c 1} {P21/a}
Cell Parameters:a = 5.78Å, b = 12.58Å, c = 5.48Å
β = 108.3°
Ratio:a:b:c = 0.459 : 1 : 0.436
Unit Cell Volume:V 378.31 ų (Calculated from Unit Cell)
Morphology:Crystals short prismatic 001]; also octahedral with large {110} and {011} and rather elongated [100]. Prisatic or fibrous aggregates and crusts; massive, granular.
Twinning:On {101}, common; twins heart-shaped at times.

Optical Data of Kröhnkite

Type:Biaxial (-)
RI values: nα = 1.544 nβ = 1.578 nγ = 1.601
2V:Measured: 78° , Calculated: 76°
Maximum Birefringence:δ = 0.057

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

Chemical Properties of Kröhnkite

Formula:
Na
 
2
Cu(SO
 
4
)
 
2
·2H
 
2
O
Essential elements:Cu, H, Na, O, S
All elements listed in formula:Cu, H, Na, O, S
Analyical Data:Readily soluble in water.
Relationship of Kröhnkite to other Species
Related Minerals - Nickel-Strunz Grouping):
7.CC.05Krausite
KFe(SO
 
4
)
 
2
·H
 
2
O
7.CC.10Amarillite
NaFe(SO
 
4
)
 
2
·6H
 
2
O
7.CC.10Tamarugite
NaAl(SO
 
4
)
 
2
·6H
 
2
O
7.CC.15Kalinite
KAl(SO
 
4
)
 
2
·11H
 
2
O Not confirmed
7.CC.15Mendozite
NaAl(SO
 
4
)
 
2
·11H
 
2
O
7.CC.20Lonecreekite
(NH
 
4
)Fe
3+
 
[SO
 
4
]
 
2
 · 12H
 
2
O
7.CC.20Alum-(K)
KAl[SO
 
4
]
 
2
 · 12H
 
2
O
7.CC.20Alum-(Na)
NaAl[SO
 
4
]
 
2
 · 12H
 
2
O
7.CC.20Tschermigite
(NH
 
4
)Al[SO
 
4
]
 
2
 · 12H
 
2
O
7.CC.20Lanmuchangite
Tl
+
 
Al[SO
 
4
]
 
2
 · 12H
 
2
O
7.CC.25Voltaite
K
 
2
Fe
2+
5
Fe
3+
3
Al[SO
 
4
]
 
12
 · 18H
 
2
O
7.CC.25Zincovoltaite
K
 
2
Zn
 
5
Fe
3+
3
Al[SO
 
4
]
 
12
 · 18H
 
2
O
7.CC.35Ferrinatrite
Na
 
3
Fe(SO
 
4
)
 
3
·3H
 
2
O
7.CC.40Goldichite
KFe(SO
 
4
)
 
2
·4H
 
2
O
7.CC.45Löweite
Na
 
12
Mg
 
7
(SO
 
4
)
 
13
7.CC.50Blödite
Na
 
2
Mg(SO
 
4
)
 
2
·4H
 
2
O
7.CC.50Nickelblödite
Na
 
2
(Ni,Mg)(SO
 
4
)
 
2
·4H
 
2
O
7.CC.50Changoite
Na
 
2
Zn(SO
 
4
)
 
2
·4H
 
2
O
7.CC.50Zincblödite
7.CC.55Leonite
K
 
2
Mg(SO
 
4
)
 
2
·4H
 
2
O
7.CC.55Mereiterite
K
 
2
Fe(SO
 
4
)
 
2
·4H
 
2
O
7.CC.60Boussingaultite
(NH
 
4
)
 
2
Mg(SO
 
4
)
 
2
·6H
 
2
O
7.CC.60Cyanochroite
K
 
2
Cu(SO
 
4
)
 
2
·6H
 
2
O
7.CC.60Konyaite
Na
 
2
Mg(SO
 
4
)
 
2
·5H
 
2
O
7.CC.60Mohrite
(NH
 
4
)
 
2
Fe(SO
 
4
)
 
2
·6H
 
2
O
7.CC.60Nickelboussingaultite
(NH
 
4
)
 
2
Ni(SO
 
4
)
 
2
·6H
 
2
O
7.CC.60Picromerite
K
 
2
Mg(SO
 
4
)
 
2
·6H
 
2
O
7.CC.65Polyhalite
K
 
2
Ca
 
2
Mg(SO
 
4
)
 
4
·2H
 
2
O
7.CC.65Wattevilleite
Na
 
2
Ca(SO
 
4
)
 
2
·4H
 
2
O (?)
7.CC.70Leightonite
K
 
2
Ca
 
2
Cu(SO
 
4
)
 
4
·2H
 
2
O
Related Minerals - Hey's Index Grouping:
25.2.1Chalcocyanite
CuSO
 
4
25.2.2Bonattite
CuSO
 
4
·3H
 
2
O
25.2.3Chalcanthite
CuSO
 
4
·5H
 
2
O
25.2.4Boothite
CuSO
 
4
·7H
 
2
O
25.2.5Dolerophanite
Cu
 
2
[O|SO
 
4
]
25.2.6Antlerite
Cu
 
3
[(OH)
 
4
|SO
 
4
]
25.2.7Brochantite
Cu
 
4
[(OH)
 
6
|SO
 
4
]
25.2.8Posnjakite
Cu
 
4
[(OH)
 
6
|SO
 
4
] · H
 
2
O
25.2.9Langite
Cu
 
4
[(OH)
 
6
|SO
 
4
] · 2H
 
2
O
25.2.10Wroewolfeite
Cu
 
4
[(OH)
 
6
|SO
 
4
] · 2H
 
2
O
25.2.12Natrochalcite
NaCu
 
2
[OH|(SO
 
4
)
 
2
] · 2H
 
2
O
25.2.13Piypite
K
 
2
Cu
 
2
[O|(SO
 
4
)
 
2
]
25.2.14Fedotovite
K
 
2
Cu
 
3
[O|(SO
 
4
)
 
3
]
25.2.15Cyanochroite
K
 
2
Cu(SO
 
4
)
 
2
·6H
 
2
O
25.2.16Euchlorine
KNaCu
 
3
[O|(SO
 
4
)
 
3
]
25.2.17Devilline
CaCu
 
4
(SO
 
4
)
 
2
(OH)
 
6
·3H
 
2
O
25.2.18Leightonite
K
 
2
Ca
 
2
Cu(SO
 
4
)
 
4
·2H
 
2
O
25.2.19Chalcoalumite
CuAl
 
4
[(OH)
 
12
|SO
 
4
] · 3H
 
2
O
25.2.20Cyanotrichite
Cu
 
4
Al
 
2
[(OH)
 
12
|SO
 
4
] · 2H
 
2
O
25.2.21Woodwardite
Cu
 
4
Al
 
2
[(OH)
 
12
|SO
 
4
] · 2-4H
 
2
O
25.2.22Campigliaite
Mn
2+
 
Cu
 
4
[(OH)
 
6
|(SO
 
4
)
 
2
] · 4H
 
2
O
25.2.23Guildite
CuFe
3+
 
[OH|(SO
 
4
)
 
2
] · 4H
 
2
O
25.2.24Ransomite
CuFe
 
2
(SO
 
4
)
 
4
·6H
 
2
O
25.2.26Klyuchevskite
K
 
3
Cu
 
3
(Fe
3+
 
,Al)[O|(SO
 
4
)
 
2
]
 
2
25.2.27Poitevinite
(Cu,Fe,Zn)SO
 
4
·H
 
2
O
25.2.28Argentojarosite
AgFe
3+
3
[(OH)
 
3
|SO
 
4
]
 
2
Other Names for Kröhnkite
Synonyms:
KroehnkiteKrömkiteKrönnkiteSalvadorite (of Herz)
German names:
Kröhnkit
Russian names:
Кренкит
Spanish names:
Kröhnkita
Other Information
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
References for Kröhnkite
Reference List:Domeyko, I. (1876) Elementos de Mineralogia, 2nd. Edition, Santiago (1860), with appendices 1 – 6, App. 5: 33.



Domeyko, I. (1879) Elementos de Mineralogia, 3rd. edition: 250 (as Krönnkite). 



Darapsky (1889) Neues Jahrbuch für Mineralogie, Geologie und Paleontologie, Heidelberg, Stuttgart: I: 192.



Herz (1896) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 26: 16 (as Salvadorite).



Palache, C. and Warren (1908) American Journal of Science: 26: 342.



Palache, C. and Warren (1908) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 45: 534.



Palache, C. (1939) American Journal of Science: 237: 447.



Gordon (1941) Academy of Sciences Philadelphia, Not. Nat., no. 72.



Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 444-446.



Leone M., Sgarlata F.(1954) - Struttura della kroehnkite e contributo alla cristallochimica del rame. . Periodico di Mineralogia – Roma pp. 223-234.



Acta Crystallographica (1975): B31: 1753-1755.


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    Localities for Kröhnkite
    
	






    


    

    
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    (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.

    Argentina
     
    

    • Córdoba
    

      • Minas Department
    
    		Sureda (1978): Revista de la Asociacion Geologica Argentina 33(4):299-324
    Australia
     
    

    • New South Wales
    

      • Yancowinna Co.
    

        • Broken Hill
    
    		Australian Min. 3:1 (1997)
    Austria
     
    

    • Styria
    

      • Niedere Tauern Mts
    

        • Öblarn
    

          • Walchen
    
    		[Lapis 1992: 2 p.19-30]
    Chile
     
    

    • Antofagasta Region
    

      • El Loa Province
    

        • Calama
    
    		Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 310, 446, 564; Acta Cryst. B31 (1975), 1753
    



Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 446.
    



Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 446.
    


      • Tocopilla Province
    

        • Sierra Gorda District
    

          • Caracoles
    
    		M.Dini & A.Molina collections-analysed material
    




www.ontariominerals.com
    

    • Tarapacá Region
    

      • Pica
    

        • Altos de Pica
    
    		Sulphides analysed by geology dep. of company; sulphates, phosphates, analysed by Bob Jenkins (Usa) 2007
    China
     
    

    • Xinjiang (Xinjiang-Uygur) Autonomous Region
    

      • Hami (Kumul; Qumul) Prefecture
    

        • Hami (Kumul; Qumul) Co.
    
    		www.xj305.gov.cn/zy/33.doc
    Greece
     
    

    • Attikí (Attica; Attika) Prefecture
    

      • Lavrion (Laurion; Laurium) District
    

        • Lavrion District Mines
    

          • Plaka
    

            • Plaka Mines
    
    		No reference listed
    Hungary
     
    

    • Heves Co.
    

      • Mátra Mts.
    

        • Recsk
    
    		No reference listed
    

    • Pest Co.
    

      • Börzsöny Mts.
    
    		Koch: Minerals of Hungary, 1985
    Italy
     
    

    • Tuscany
    

      • Livorno Province
    

        • Elba Island
    

          • Capoliveri
    

            • Cape Calamita Mine (Calamita Mine)
    
    		F. Quagliarella (1966) - Su alcuni solfati di Capo Calamita (Isola d'Elba) - Rend. Soc. Min. It., 22: 210.
    UK
     
    

    • England
    

      • Cornwall
    

        • St Just District
    

          • Botallack - Pendeen Area
    

            • Botallack
    

              • Botallack Mine
    
    		No reference listed
    USA
     
    

    • California
    

      • Alameda Co.
    

        • Oakland
    

          • Leona Heights
    
    		No reference listed
    




[Mineralogical Record 20 129-142]
    

    • Virginia
    

      • Floyd Co.
    

        • Southern Section-Blue Ridge Province
    

          • Southern Lead
    
    		Minerals of Virginia, 1990 by R. V. Dietrich
    

    


    

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