Krohnkite Mineral Data

Krohnkite Mineral Data
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General Krohnkite Information

Help on Chemical Formula: Chemical Formula: Na2Cu(SO4)2•2(H2O)
Help on Composition: Composition: Molecular Weight = 337.68 gm
   Sodium    13.62 %  Na   18.35 % Na2O
   Copper    18.82 %  Cu   21.19 % Cu2O
   Hydrogen   1.19 %  H    10.67 % H2O
   Sulfur    18.99 %  S    47.42 % SO3
   Oxygen    47.38 %  O
            ______        ______ 
            100.00 %       97.63 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na2Cu(SO4)2•2(H2O)
Help on Environment: Environment: Secondary mineral in copper-bearing sulfide deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1876
Help on Locality: Locality: Chuquicamata, Calama, Antofagásta Province, Chile. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after B. Kroehnke, who was the first person to analyze it.
Help on Synonym: Synonym: Kroehnkite
 

Krohnkite Image

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Krohnkite   Natrochalcite

Comments: Royal blue kröhnkite and green natrochalcite.
Location: Chiquicamata, Chile. Scale: 3.5 x 2 cm.
© John Veevaert

Krohnkite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.4584:1:0.4356
Help on Cell Dimensions: Cell Dimensions: a = 5.8, b = 12.651, c = 5.512, Z = 2; beta = 108.45° V = 383.66 Den(Calc)= 2.92
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 6.32(1), 3.28(0.75), 2.928(0.65),
Help on Forms: Forms:

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Forms: ( 1 1 1) ( 0 1 0) ( 0 1 1) ( 1 3 0) ( 1 3 1) ( 1 2 0) ( 0 1 2) ( 1 0 0) ( 1 1 0)

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Hawthorne F C , Ferguson R B , Acta Crystallographica, Section B , 31 (1975) p.1753-1755, Refinement of the crystal structure of krohnkite, Locality: Chuquicamata, Chile

 

Physical Properties of Krohnkite

Help on Cleavage: Cleavage: {010} Perfect, {011} Good
Help on Color: Color: Blue, Dark sky blue, Greenish blue, Yellowish green.
Help on Density: Density: 2.06 - 2.9, Average = 2.48
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Encrustations - Forms crust-like aggregates on matrix.
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Habit: Habit: Massive - Fibrous - Distinctly fibrous fine-grained forms.
Help on Hardness: Hardness: 2.5-3 - Finger Nail-Calcite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Krohnkite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.132 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.039 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1967,KPDmeas= 0.2316,KC= 0.2047
Ncalc = 1.42 - 1.6
Help on Optical Data: Optical Data: Biaxial (-), a=1.544, b=1.578, g=1.601, bire=0.0570, 2V(Calc)=76, 2V(Meas)=78.7.
 

Calculated Properties of Krohnkite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.89 gm/cc
note: Specific Gravity of Krohnkite =2.92 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0016535964
Boson Index = 0.9983464036
Help on Photoelectric: Photoelectric: PEKrohnkite = 9.42 barns/electron
U=PEKrohnkite x rElectron Density= 27.20 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Krohnkite is Not Radioactive
 

Krohnkite Classification
Help on Dana Class: Dana Class: 29.03.02.01 (29)Hydrated Acid and Sulfates
  (29.03)where (A+)2 B (XO4)2 · x(H2O)
  (29.03.02)Dana Group
 
29.03.02.01 Krohnkite Na2Cu(SO4)2•2(H2O) P 21/c 2/m
Help on Strunz Class: Strunz Class: 07.CC.30 07 - SULFATES (SELENATES, TELLURATES)
  07.C - Sulfates (selenates, etc.) without Additional Anions, with H2O
  07.CC -With medium-sized and large cations
 
07.CC.30 Krohnkite Na2Cu(SO4)2•2(H2O) P 21/c 2/m
 

Other Krohnkite Information
Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Krohnkite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - MinMax(Deutsch)
10 - MinMax(English)
11 - Mineralienatlas (Deutsch)
12 - QUT Mineral Atlas
13 - Ruff.Info
14 - WWW-MINCRYST

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Krohnkite

Na2Cu(SO4)2•2(H2O)
Dana No: 29.03.02.01 Strunz No: 07.CC.30
Locality:

 

Notes: