Mineralogy Database

Cyanochroite Mineral Data

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General Cyanochroite Information

Help on Chemical  Formula: Chemical Formula: K2Cu(SO4)2•6(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: K2Cu(SO4)2•6(H2O)
Help on Environment: Environment: Product of fumarolic action.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1855
Help on Locality: Locality: Vesuvius, Campania, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named from the Greek for blue and color, in reference to its appearance in white light.
Help on Synonym: Synonym: ICSD 2925
  PDF 17-137

Cyanochroite Image

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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

Help on Axial Ratios: Axial Ratios: a:b:c =0.7487:1:0.509
Help on Cell Dimensions: Cell Dimensions: a = 9.09, b = 12.14, c = 6.18, Z = 2; beta = 105.5° V = 657.18 Den(Calc)= 2.23
Help on Crystal System: 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/Io): 3.7(1), 4.21(0.8), 4.09(0.6),

Physical Properties of Cyanochroite

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

Optical Properties of Cyanochroite

Help on Gladstone-Dale: 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
Help on Optical Data: 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

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

Help on  Dana Class: Dana Class: (29)Hydrated Acid and Sulfates
  (29.03)where (A+)2 B (XO4)2 � x(H2O)
  (29.03.06)Dana Group Picromerite K2Mg(SO4)2•6(H2O) P 21/a 2/m Cyanochroite K2Cu(SO4)2•6(H2O) P 21/a 2/m
Help on  Strunz Class: 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

Help on References: References: NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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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Dana No: Strunz No: 07.CC.60





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