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Cyanochroite

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Somma-Vesuvius Complex, Naples Province, Campania, Italy
© Brent Thorne

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Formula:
K
 
2
Cu(SO
 
4
)
 
2
 · 6H
 
2
O
System:MonoclinicColour:Greenish-blue
Lustre:VitreousHardness:2 - 2½
Member of:Picromerite Group
Name:From the Greek κυανός for "blue" and χρώσις for "colouring", in allusion to the color.


Picromerite Group

Classification of Cyanochroite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:6/C.19-20
Nickel-Strunz 10th (pending) edition ID:7.CC.60

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:29.3.6.2

29 : HYDRATED ACID AND NORMAL SULFATES
3 : A2B(XO4)2·xH2O
Hey's CIM Ref.:25.2.15

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

Type Locality:Mt Vesuvius, Somma-Vesuvius Complex, Naples Province, Campania, Italy
Year of Discovery:1855
Geological Setting of type material:Active volcanic fumaroles.

Physical Properties of Cyanochroite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:Greenish-blue
Hardness (Mohs):2 - 2½
Cleavage:Perfect
{_201}, perfect.
Density (measured):2.224 g/cm3
Comment:Measured on artificial material.

Crystallography of Cyanochroite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Cell Parameters:a = 9.09Å, b = 12.14Å, c = 6.18Å
β = 104.47°
Ratio:a:b:c = 0.749 : 1 : 0.509
Unit Cell Volume:V 660.35 ų (Calculated from Unit Cell)
Morphology:Crystals tabular {001}. CVrystalline crusts.

Optical Data of Cyanochroite

Type:Biaxial (+)
RI values: nα = 1.484 nβ = 1.486 nγ = 1.502
2V:Measured: 46° , Calculated: 48°
Maximum Birefringence:δ = 0.018

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:r > v to r < v strong

Chemical Properties of Cyanochroite

Formula:
K
 
2
Cu(SO
 
4
)
 
2
 · 6H
 
2
O
Essential elements:Cu, H, K, O, S
All elements listed in formula:Cu, H, K, O, S
Analytical Data:Water soluble.
Relationship of Cyanochroite to other Species
Member of:Picromerite Group
Other Members of Group:

- + 
Boussingaultite
(NH
 
4
)
 
2
Mg(SO
 
4
)
 
2
 · 6H
 
2
O
Boussingaultite-Mohrite Series
Mohrite
(NH
 
4
)
 
2
Fe(SO
 
4
)
 
2
 · 6H
 
2
O
Nickelboussingaultite
(NH
 
4
)
 
2
Ni(SO
 
4
)
 
2
 · 6H
 
2
O
Picromerite
K
 
2
Mg(SO
 
4
)
 
2
 · 6H
 
2
O
Related Minerals - Nickel-Strunz Grouping):

- + 
7.CC.05Krausite
KFe(SO
 
4
)
 
2
 · H
 
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.25Pertlikite
K
 
2
(Fe
2+
 
,Mg)
 
2
Mg
 
4
Fe
3+
2
Al(SO
 
4
)
 
12
 · 18H
 
2
O
7.CC.25Ammoniomagnesiovoltaite
(NH
 
4
)
 
2
Mg
2+
5
Fe
3+
3
Al(SO
 
4
)
 
12
 · 18H
 
2
O
7.CC.30Kröhnkite
Na
 
2
Cu(SO
 
4
)
 
2
 · 2H
 
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.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.70Leightonite
K
 
2
Ca
 
2
Cu(SO
 
4
)
 
4
 · 2H
 
2
O
7.CC.75Amarillite
NaFe(SO
 
4
)
 
2
 · 6H
 
2
O
7.CC.80Konyaite
Na
 
2
Mg(SO
 
4
)
 
2
 · 5H
 
2
O
7.CC.85Wattevilleite
Na
 
2
Ca(SO
 
4
)
 
2
 · 4H
 
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
(SO
 
4
)O
25.2.6Antlerite
Cu
 
3
(SO
 
4
)(OH)
 
4
25.2.7Brochantite
Cu
 
4
(SO
 
4
)(OH)
 
6
25.2.8Posnjakite
Cu
 
4
(SO
 
4
)(OH)
 
6
 · H
 
2
O
25.2.9Langite
Cu
 
4
(SO
 
4
)(OH)
 
6
 · 2H
 
2
O
25.2.10Wroewolfeite
Cu
 
4
(SO
 
4
)(OH)
 
6
 · 2H
 
2
O
25.2.11Kröhnkite
Na
 
2
Cu(SO
 
4
)
 
2
 · 2H
 
2
O
25.2.12Natrochalcite
NaCu
 
2
(SO
 
4
)
 
2
(OH) · 2H
 
2
O
25.2.13Piypite
K
 
2
Cu
 
2
(SO
 
4
)
 
2
O
25.2.14Fedotovite
K
 
2
Cu
 
3
(SO
 
4
)
 
3
O
25.2.16Euchlorine
KNaCu
 
3
(SO
 
4
)
 
3
O
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
(SO
 
4
)(OH)
 
12
 · 3H
 
2
O
25.2.20Cyanotrichite
Cu
 
4
Al
 
2
(SO
 
4
)(OH)
 
12
 · 2H
 
2
O
25.2.21Woodwardite
Cu
 
4
Al
 
2
(SO
 
4
)(OH)
 
12
 · 2-4H
 
2
O
25.2.22Campigliaite
Mn
2+
 
Cu
 
4
(SO
 
4
)
 
2
(OH)
 
6
 · 4H
 
2
O
25.2.23Guildite
CuFe
3+
 
(SO
 
4
)
 
2
(OH) · 4H
 
2
O
25.2.24Ransomite
CuFe
 
2
(SO
 
4
)
 
4
 · 6H
 
2
O
25.2.26Klyuchevskite
K
 
3
Cu
 
3
(Fe
3+
 
,Al)(SO
 
4
)
 
4
O
 
2
25.2.27Poitevinite
(Cu,Fe,Zn)SO
 
4
 · H
 
2
O
25.2.28Argentojarosite
AgFe
3+
3
(SO
 
4
)
 
2
(OH)
 
6
Other Names for Cyanochroite
Synonyms:
CianocroiteCyanochrome
Other Languages:
German:Cianocroit
Cyanochroit
Italian:Cianochroma
Spanish:Cianocroita
Cyanochroita
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 Cyanochroite
Reference List:

- + 
Scacchi (1855) Memoria sullo Incendio Vesuviano: 191.



Dana, J.D. (1868) System of Mineralogy, 5th. Edition, New York: 649.



Tutton (1897) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 27: 191.



Lacroix (1907) Bulletin de la Société française de Minéralogie: 30: 223.



Goldschmidt, V. (1913) Atlas der Krystallformen. 9 volumes, atlas, and text: vol. 2: 200.



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, 1124 pp.: 454.



Periodico di Mineralogia (1985): 54: 1.


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    • Localities for Cyanochroite
    






    


    

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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.

    Greece
     
    

    • Attikí (Attica; Attika) Prefecture
    

      • Lavrion (Laurion; Laurium) District
    
    		Gelaude, Piet, van Kalmthout, Piet and Rewitzer, Christian, Laurion: The Minerals in the Ancient Slags; Schnorrer-Köhler, G. (1986): Neufunde in den Schlacken von Lavrion. LAPIS 11 (6), 25-29
    Italy
     
    

    • Campania
    

      • Naples Province
    

        • Somma-Vesuvius Complex
    
    		Russo, M., 2006: I minerali di formazione fumarolica della grande eruzione vesuviana del 1906
    Russia
     
    

    • Far-Eastern Region
    

      • Kamchatka Oblast'
    

        • Tolbachik volcano
    

          • Great Fissure (Main Fracture) eruption
    

            • Northern Breakthrough (North Breach)
    
    		P.M. Kartashov data; P.M. Kartashov data
    

    


    

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