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

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 - Prismatic H-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

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 ï¿½ 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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Cyanochroite

K2Cu(SO4)2•6(H2O)
Dana No: 29.03.06.02 Strunz No: 07.CC.60
Locality:

Notes:

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