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Cyanochroite

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Formula:
K2Cu(SO4)2 · 6H2O
Colour:
Greenish-blue
Lustre:
Vitreous
Hardness:
2 - 2½
Specific Gravity:
2.224
Crystal System:
Monoclinic
Name:
From the Greek κυανός for "blue" and χρώσις for "colouring", in allusion to the color.
Hide all sections | Show all sections

Classification of CyanochroiteHide

Approved, 'Grandfathered' (first described prior to 1959)
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

Physical Properties of CyanochroiteHide

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

Optical Data of CyanochroiteHide

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 CyanochroiteHide

Formula:
K2Cu(SO4)2 · 6H2O

Crystallography of CyanochroiteHide

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

Type Occurrence of CyanochroiteHide

Geological Setting of Type Material:
Active volcanic fumaroles.

Synonyms of CyanochroiteHide

Other Language Names for CyanochroiteHide

Relationship of Cyanochroite to other SpeciesHide

Other Members of this group:
Boussingaultite(NH4)2Mg(SO4)2 · 6H2OMon. 2/m : P21/b
Mohrite(NH4)2Fe(SO4)2 · 6H2OMon. 2/m : P21/b
Nickelboussingaultite(NH4)2Ni(SO4)2 · 6H2O
NickelpicromeriteK2Ni(SO4)2•6H2OMon. 2/m : P21/b
PicromeriteK2Mg(SO4)2 · 6H2OMon. 2/m

Related Minerals - Nickel-Strunz GroupingHide

7.CC.AndychristyitePbCu2+Te6+O5(H2O)Tric. 1 : P1
7.CC.05KrausiteKFe(SO4)2 · H2OMon. 2/m : P21/m
7.CC.10TamarugiteNaAl(SO4)2 · 6H2OMon. 2/m
7.CC.15KaliniteKAl(SO4)2 · 11H2O Not confirmedMon. 2/m : B2/b
7.CC.15MendoziteNaAl(SO4)2 · 11H2OMon. 2/m
7.CC.20Lonecreekite(NH4)Fe3+(SO4)2 · 12H2OIso.
7.CC.20Alum-(K)KAl(SO4)2 · 12H2OIso. m3 (2/m 3)
7.CC.20Alum-(Na)NaAl(SO4)2 · 12H2O
7.CC.20Tschermigite(NH4)Al(SO4)2 · 12H2OIso. m3 (2/m 3) : Pa3
7.CC.20LanmuchangiteTl+Al(SO4)2 · 12H2OIso. m3 (2/m 3) : Pa3
7.CC.25VoltaiteK2Fe2+5Fe3+3Al(SO4)12 · 18H2OIso. m3m (4/m 3 2/m) : Fd3c
7.CC.25ZincovoltaiteK2Zn5Fe3+3Al(SO4)12 · 18H2OIso. m3m (4/m 3 2/m) : Fd3c
7.CC.25PertlikiteK2(Fe2+,Mg)2Mg4Fe3+2Al(SO4)12 · 18H2OTet. 4/mmm (4/m 2/m 2/m) : I41/acd
7.CC.25Ammoniomagnesiovoltaite(NH4)2Mg2+5Fe3+3Al(SO4)12 · 18H2OIso. m3m (4/m 3 2/m) : Fd3c
7.CC.30KröhnkiteNa2Cu(SO4)2 · 2H2OMon. 2/m : P21/b
7.CC.35FerrinatriteNa3Fe(SO4)3 · 3H2OTrig. 3 : P3
7.CC.40GoldichiteKFe(SO4)2 · 4H2OMon. 2/m : P21/b
7.CC.45LöweiteNa12Mg7(SO4)13 · 15H2OTrig.
7.CC.50BlöditeNa2Mg(SO4)2 · 4H2OMon. 2/m
7.CC.50NickelblöditeNa2(Ni,Mg)(SO4)2 · 4H2O
7.CC.50ChangoiteNa2Zn(SO4)2 · 4H2OMon. 2/m : P21/b
7.CC.50ZincblöditeNa2Zn(SO4)2 · 4H2O
7.CC.55LeoniteK2Mg(SO4)2 · 4H2OMon. 2/m
7.CC.55MereiteriteK2Fe(SO4)2 · 4H2OMon.
7.CC.60Boussingaultite(NH4)2Mg(SO4)2 · 6H2OMon. 2/m : P21/b
7.CC.60Mohrite(NH4)2Fe(SO4)2 · 6H2OMon. 2/m : P21/b
7.CC.60Nickelboussingaultite(NH4)2Ni(SO4)2 · 6H2O
7.CC.60PicromeriteK2Mg(SO4)2 · 6H2OMon. 2/m
7.CC.65PolyhaliteK2Ca2Mg(SO4)4 · 2H2OTric. 1
7.CC.70LeightoniteK2Ca2Cu(SO4)4 · 2H2OTric.
7.CC.75AmarilliteNaFe(SO4)2 · 6H2OMon. 2/m : B2/b
7.CC.80KonyaiteNa2Mg(SO4)2 · 5H2OMon. 2/m : P21/b
7.CC.85WattevilleiteNa2Ca(SO4)2 · 4H2O (?)Orth.

Related Minerals - Dana Grouping (8th Ed.)Hide

29.3.6.1PicromeriteK2Mg(SO4)2 · 6H2OMon. 2/m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

25.2.1ChalcocyaniteCuSO4Orth. mmm (2/m 2/m 2/m)
25.2.2BonattiteCuSO4 · 3H2OMon.
25.2.3ChalcanthiteCuSO4 · 5H2OTric. 1 : P1
25.2.4BoothiteCuSO4 · 7H2OMon.
25.2.5DolerophaniteCu2(SO4)OMon. 2/m : B2/m
25.2.6AntleriteCu3(SO4)(OH)4Orth. mmm (2/m 2/m 2/m)
25.2.7BrochantiteCu4(SO4)(OH)6Mon. 2/m : P21/b
25.2.8PosnjakiteCu4(SO4)(OH)6 · H2OMon. m : Pm
25.2.9LangiteCu4(SO4)(OH)6 · 2H2OMon. m
25.2.10WroewolfeiteCu4(SO4)(OH)6 · 2H2OMon. m : Pm
25.2.11KröhnkiteNa2Cu(SO4)2 · 2H2OMon. 2/m : P21/b
25.2.12NatrochalciteNaCu2(SO4)2(OH) · 2H2OMon. 2/m : B2/m
25.2.13PiypiteK4Cu4O2(SO4)4 · (Na,Cu)ClTet.
25.2.14FedotoviteK2Cu3(SO4)3OMon. 2/m : B2/b
25.2.16EuchlorineKNaCu3(SO4)3OMon.
25.2.17DevillineCaCu4(SO4)2(OH)6 · 3H2OMon. 2/m : P21/b
25.2.18LeightoniteK2Ca2Cu(SO4)4 · 2H2OTric.
25.2.19ChalcoalumiteCuAl4(SO4)(OH)12 · 3H2OMon. 2 : P21
25.2.20CyanotrichiteCu4Al2(SO4)(OH)12 · 2H2OOrth.
25.2.21WoodwarditeCu1-xAlx(OH)2[SO4]x/2 · nH2OTrig. 3m (3 2/m) : R3m
25.2.22CampigliaiteMn2+Cu4(SO4)2(OH)6 · 4H2OMon.
25.2.23GuilditeCuFe3+(SO4)2(OH) · 4H2OMon.
25.2.24RansomiteCuFe2(SO4)4 · 6H2OMon. 2/m : P21/b
25.2.26KlyuchevskiteK3Cu3(Fe3+,Al)(SO4)4O2Mon.
25.2.27Poitevinite(Cu,Fe,Zn)SO4 · H2OTric.
25.2.28ArgentojarositeAgFe3+3(SO4)2(OH)6Trig. 3m : R3m

Other InformationHide

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 CyanochroiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 CyanochroiteHide

Localities for CyanochroiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
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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