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Cyanochroite

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Formula:
K2Cu(SO4)2 · 6H2O
System:
Monoclinic
Colour:
Greenish-blue
Lustre:
Vitreous
Hardness:
2 - 2½
Name:
From the Greek κυανός for "blue" and χρώσις for "colouring", in allusion to the color.

Classification of Cyanochroite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
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
29.3.6.2

29 : HYDRATED ACID AND NORMAL SULFATES
3 : A2B(XO4)2·xH2O
25.2.15

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

Year of Discovery:
1855
Geological Setting of Type Material:
Active volcanic fumaroles.

Physical Properties of Cyanochroite

Vitreous
Diaphaneity (Transparency):
Transparent
Colour:
Greenish-blue
Hardness (Mohs):
2 - 2½
Cleavage:
Perfect
{_201}, perfect.
Density:
2.224 g/cm3 (Measured)    
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°
Max Birefringence:
δ = 0.018
Image 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:
K2Cu(SO4)2 · 6H2O
Essential elements:
All elements listed in formula:
Analytical Data:
Water soluble.

Relationship of Cyanochroite to other Species

Other Members of Group:
Boussingaultite(NH4)2Mg(SO4)2 · 6H2O
Mohrite(NH4)2Fe(SO4)2 · 6H2O
Nickelboussingaultite(NH4)2Ni(SO4)2 · 6H2O
NickelpicromeriteK2Ni(SO4)2•6H2O
PicromeriteK2Mg(SO4)2 · 6H2O
7.CC.05KrausiteKFe(SO4)2 · H2O
7.CC.10TamarugiteNaAl(SO4)2 · 6H2O
7.CC.15KaliniteKAl(SO4)2 · 11H2O Not confirmed
7.CC.15MendoziteNaAl(SO4)2 · 11H2O
7.CC.20Lonecreekite(NH4)Fe3+(SO4)2 · 12H2O
7.CC.20Alum-(K)KAl(SO4)2 · 12H2O
7.CC.20Alum-(Na)NaAl(SO4)2 · 12H2O
7.CC.20Tschermigite(NH4)Al(SO4)2 · 12H2O
7.CC.20LanmuchangiteTl+Al(SO4)2 · 12H2O
7.CC.25VoltaiteK2Fe52+Fe33+Al(SO4)12 · 18H2O
7.CC.25ZincovoltaiteK2Zn5Fe33+Al(SO4)12 · 18H2O
7.CC.25PertlikiteK2(Fe2+,Mg)2Mg4Fe23+Al(SO4)12 · 18H2O
7.CC.25Ammoniomagnesiovoltaite(NH4)2Mg52+Fe33+Al(SO4)12 · 18H2O
7.CC.30KröhnkiteNa2Cu(SO4)2 · 2H2O
7.CC.35FerrinatriteNa3Fe(SO4)3 · 3H2O
7.CC.40GoldichiteKFe(SO4)2 · 4H2O
7.CC.45LöweiteNa12Mg7(SO4)13 · 15H2O
7.CC.50BlöditeNa2Mg(SO4)2 · 4H2O
7.CC.50NickelblöditeNa2(Ni,Mg)(SO4)2 · 4H2O
7.CC.50ChangoiteNa2Zn(SO4)2 · 4H2O
7.CC.50Zincblödite
7.CC.55LeoniteK2Mg(SO4)2 · 4H2O
7.CC.55MereiteriteK2Fe(SO4)2 · 4H2O
7.CC.60Boussingaultite(NH4)2Mg(SO4)2 · 6H2O
7.CC.60Mohrite(NH4)2Fe(SO4)2 · 6H2O
7.CC.60Nickelboussingaultite(NH4)2Ni(SO4)2 · 6H2O
7.CC.60PicromeriteK2Mg(SO4)2 · 6H2O
7.CC.65PolyhaliteK2Ca2Mg(SO4)4 · 2H2O
7.CC.70LeightoniteK2Ca2Cu(SO4)4 · 2H2O
7.CC.75AmarilliteNaFe(SO4)2 · 6H2O
7.CC.80KonyaiteNa2Mg(SO4)2 · 5H2O
7.CC.85WattevilleiteNa2Ca(SO4)2 · 4H2O (?)
25.2.1ChalcocyaniteCuSO4
25.2.2BonattiteCuSO4 · 3H2O
25.2.3ChalcanthiteCuSO4 · 5H2O
25.2.4BoothiteCuSO4 · 7H2O
25.2.5DolerophaniteCu2(SO4)O
25.2.6AntleriteCu3(SO4)(OH)4
25.2.7BrochantiteCu4(SO4)(OH)6
25.2.8PosnjakiteCu4(SO4)(OH)6 · H2O
25.2.9LangiteCu4(SO4)(OH)6 · 2H2O
25.2.10WroewolfeiteCu4(SO4)(OH)6 · 2H2O
25.2.11KröhnkiteNa2Cu(SO4)2 · 2H2O
25.2.12NatrochalciteNaCu2(SO4)2(OH) · 2H2O
25.2.13PiypiteK2Cu2(SO4)2O
25.2.14FedotoviteK2Cu3(SO4)3O
25.2.16EuchlorineKNaCu3(SO4)3O
25.2.17DevillineCaCu4(SO4)2(OH)6 · 3H2O
25.2.18LeightoniteK2Ca2Cu(SO4)4 · 2H2O
25.2.19ChalcoalumiteCuAl4(SO4)(OH)12 · 3H2O
25.2.20CyanotrichiteCu4Al2(SO4)(OH)12 · 2H2O
25.2.21WoodwarditeCu1-xAlx(OH)2[SO4]x/2 · nH2O
25.2.22CampigliaiteMn2+Cu4(SO4)2(OH)6 · 4H2O
25.2.23GuilditeCuFe3+(SO4)2(OH) · 4H2O
25.2.24RansomiteCuFe2(SO4)4 · 6H2O
25.2.26KlyuchevskiteK3Cu3(Fe3+,Al)(SO4)4O2
25.2.27Poitevinite(Cu,Fe,Zn)SO4 · H2O
25.2.28ArgentojarositeAgFe33+(SO4)2(OH)6

Other Names for Cyanochroite

Name in Other Languages:

Other Information

Health Risks:
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.

Internet Links for Cyanochroite

Localities for Cyanochroite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
Canada
 
  • British Columbia
    • New Westminster Mining Division
      • Hope
TRAILL, R.J. (1983): A catalogue of Canadian minerals, Geological Survey of Canada Paper
Greece
 
  • Attikí Prefecture (Attica; Attika)
    • Lavrion District (Laurion; Laurium)
Gelaude, Piet, van Kalmthout, Piet and Rewitzer, Christian, Laurion: The Minerals in the Ancient Slags; Schnorrer-Köhler, G. (1986): Neufunde in den Schlacken von Laurion. Lapis, 11 (6), 25-29; 42.
Italy (TL)
 
  • 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 eruption (Main Fracture)
          • Northern Breakthrough (North Breach)
P.M. Kartashov data; P.M. Kartashov data
Pekov, I. V., Zelenski, M. E., Zubkova, N. V., Yapaskurt, V. O., Chukanov, N. V., Belakovskiy, D. I., & Pushcharovsky, D. Y. (2012). Calciolangbeinite, K2Ca2 (SO4) 3, a new mineral from the Tolbachik volcano, Kamchatka, Russia. Mineralogical Magazine, 76(3), 673-682.
Mineral and/or Locality  
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