Cyanochroite Mineral Data

Cyanochroite Mineral Data

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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)

IMA Status:

Valid Species (Pre-IMA) 1855

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 2925

PDF 17-137

Cyanochroite Image

Images:

Cyanochroite

Comments: Pale blue crystal cluster of cyanochroite.
Location: Eruption of 1870, Mount Vesuvius, Napoli, Campania, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.7(1), 4.21(0.8), 4.09(0.6),

Physical Properties of Cyanochroite

Cleavage:

[201] Perfect

Color:

Green blue.

Density:

2.224

Diaphaniety:

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

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:

r_electron=2.25 gm/cc
note: r_Cyanochroite=2.23 gm/cc.

Fermion Index

Fermion Index = 0.00135
Boson Index = 0.99865

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)

Estimated Radioactivity from Cyanochroite - barely detectable

Cyanochroite Classification

Dana Class:

29.3.6.2 (29)Hydrated Acid and Sulfates

(29.3)where (A+)2 B (XO4)2 · x(H2O)

(29.3.6)Dana Group

29.3.6.1 Picromerite K2Mg(SO4)2·6(H2O) P 2₁/a 2/m

29.3.6.2 Cyanochroite K2Cu(SO4)2·6(H2O) P 2₁/a 2/m

Strunz Class:

VI/C.19-20 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/C - Water-bearing sulfates without unfamiliar anions. cations of medium and very big size

VI/C.19 - Picromerite group

VI/C.19-10 Picromerite K2Mg(SO4)2·6(H2O) P 2₁/a 2/m

VI/C.19-20 Cyanochroite K2Cu(SO4)2·6(H2O) P 2₁/a 2/m

VI/C.19-30 Boussingaultite (NH4)2Mg(SO4)2·6(H2O) P 2₁/a 2/m

VI/C.19-40 Nickel-boussingaultite (NH4)2(Ni,Mg)(SO4)2·6(H2O) P 2₁/a 2/m

VI/C.19-50 Mohrite (NH4)2Fe(SO4)2·6(H2O) P 2₁/c 2/m

Other Cyanochroite Information

References:

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Cyanochroite

K2Cu(SO4)2·6(H2O)
Dana No: 29.3.6.2 Strunz No: VI/C.19-20
Locality:

Notes: