Cyanochroite Mineral Data

General Cyanochroite Information

Chemical Formula: K2Cu(SO4)2•6(H2O) Composition: Molecular Weight = 441.96 gm    Potassium  17.69 %  K    21.31 % K₂O    Copper     14.38 %  Cu   18.00 % CuO    Hydrogen    2.74 %  H    24.46 % H₂O    Sulfur     14.51 %  S    36.23 % SO₃    Oxygen     50.68 %  O              ______        ______               100.00 %      100.00 % = TOTAL OXIDE Empirical Formula: K₂Cu(SO₄)₂•6(H₂O) Environment: Product of fumarolic action. IMA Status: Valid Species (Pre-IMA) 1855 Locality: Vesuvius, Campania, Italy. Link to MinDat.org Location Data. Name Origin: Named from the Greek for blue and color, in reference to its appearance in white light. Synonym: ICSD 2925   PDF 17-137  

Cyanochroite Image

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Cyanochroite Crystallography

Axial Ratios: a:b:c =0.7487:1:0.509 Cell Dimensions: a = 9.09, b = 12.14, c = 6.18, Z = 2; beta = 105.5° V = 657.18 Den(Calc)= 2.23 Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/a X Ray Diffraction: By Intensity(I/I_o): 3.7(1), 4.21(0.8), 4.09(0.6), Crystal Structure:

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Robinson D J , Kennard C H L , Crystal Structure Communications , 1 (1972) p.185-188, Potassium hexa-aquacopper(II) sulfate, CuH12K2O14S2 (neutron), Locality: synthetic

 

Physical Properties of Cyanochroite

Cleavage: {201} Perfect Color: Green blue. Density: 2.224 Diaphaneity: Transparent Hardness: 2-2.5 - Gypsum-Finger Nail Luster: Vitreous (Glassy) Streak: white  

Optical Properties of Cyanochroite

Gladstone-Dale: CI meas= -0.004 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.002 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.22,KPDmeas= 0.2206,KC= 0.2197
Ncalc = 1.49 Optical Data: Biaxial (+), a=1.4836, b=1.4864, g=1.502, bire=0.0184, 2V(Calc)=48, 2V(Meas)=46.533.  

Calculated Properties of Cyanochroite

Electron Density: Bulk Density (Electron Density)=2.25 gm/cc
note: Specific Gravity of Cyanochroite =2.23 gm/cc.
Fermion Index: Fermion Index = 0.0013569143
Boson Index = 0.9986430857 Photoelectric: PE_Cyanochroite = 8.69 barns/electron
U=PE_Cyanochroite x r_electron= 19.55 barns/cc.
Radioactivity:

GRapi = 257.62 (Gamma Ray American Petroleum Institute Units)
Concentration of Cyanochroite per GRapi unit = 0.39 (%)

Estimated Radioactivity from Cyanochroite - barely detectable

 

Cyanochroite Classification

Dana Class: 29.03.06.02 (29)Hydrated Acid and Sulfates   (29.03)where (A+)2 B (XO4)2 · x(H2O)   (29.03.06)Dana Group  

29.03.06.01 Picromerite K2Mg(SO4)2•6(H2O) P 2₁/a 2/m

 

29.03.06.02 Cyanochroite K2Cu(SO4)2•6(H2O) P 2₁/a 2/m

Strunz Class: 07.CC.60 07 - SULFATES (SELENATES, TELLURATES)   07.C - Sulfates (selenates, etc.) without Additional Anions, with H2O   07.CC -With medium-sized and large cations  

07.CC.60 Boussingaultite (NH4)2Mg(SO4)2•6(H2O) P 2₁/a 2/m

 

07.CC.60 Cyanochroite K2Cu(SO4)2•6(H2O) P 2₁/a 2/m

 

07.CC.60 Mohrite (NH4)2Fe(SO4)2•6(H2O) P 2₁/c 2/m

 

07.CC.60 Picromerite K2Mg(SO4)2•6(H2O) P 2₁/a 2/m

 

07.CC.60 Nickelboussingaultite (NH4)2(Ni,Mg)(SO4)2•6(H2O) P 2₁/a 2/m

 

Other Cyanochroite Information

References: NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) See Also: Links to other databases for Cyanochroite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
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