Mineralogy Database

Clinoatacamite Mineral Data

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General Clinoatacamite Information

Help on Chemical  Formula: Chemical Formula: Cu2(OH)3Cl
Help on Composition: Composition: Molecular Weight = 213.57 gm
   Copper    59.51 %  Cu   74.49 % CuO
   Hydrogen   1.42 %  H    12.65 % H2O
   Chlorine  16.60 %  Cl   16.60 % Cl
               -   %   Cl   -3.75 % -O=Cl2   
   Oxygen    22.47 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Cu2(OH)3Cl
Help on Environment: Environment: Secondary alteration product of copper ores.
Help on IMA Status: IMA Status: Approved IMA 1996 (Dana # Added)
Help on Locality: Locality: Chuquicamata, Chile. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For the relationship to atacamite and paratacamite. Atacamite is named after the Atacam desert province in northern Chile.
Help on Synonym: Synonym: ICSD 82485
  PDF 25-1427

Clinoatacamite Image

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Comments: Green clinoatacamite on halite and anhydrite.
Location: Bernburg, Stassfurt Deposit, Saxony-Anhalt, Germany. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Clinoatacamite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9035:1:1.336
Help on Cell Dimensions: Cell Dimensions: a = 6.157, b = 6.814, c = 9.104, Z = 4; beta = 99.65° V = 376.54 Den(Calc)= 3.77
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/n
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 5.47(1), 2.742(0.7), 2.767(0.6),

Physical Properties of Clinoatacamite

Help on Cleavage: Cleavage: {012} Perfect
Help on Color: Color: Green, Dark greenish black, Greenish blue.
Help on Density: Density: 3.71
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Crystalline - Fine - Occurs as well-formed fine sized crystals.
Help on Hardness: Hardness: 3 - Calcite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Adamantine
Help on Streak: Streak: greenish white

Optical Properties of Clinoatacamite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.036 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.019 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2263,KPDmeas= 0.23,KC= 0.2221
Ncalc = 1.82 - 1.84
Help on Optical Data: Optical Data: Biaxial (-), a=1.83, b=1.85, g=1.88, bire=0.0500, 2V(Calc)=80, 2V(Meas)=75. Dispersion strong, r < v.

Calculated Properties of Clinoatacamite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.60 gm/cc
note: Specific Gravity of Clinoatacamite =3.77 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0001100017
Boson Index = 0.9998899983
Help on Photoelectric: Photoelectric: PEClinoatacamite = 27.37 barns/electron
U=PEClinoatacamite x rElectron Density= 98.57 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Clinoatacamite is Not Radioactive

Clinoatacamite Classification

Help on  Dana Class: Dana Class: (10)Oxyhalides and Hydroxyhalides
  (10.01)where (A)2 (O,OH)3 Xq
  (10.01.02)Paratacamite Group Paratacamite (Cu,Zn)2(OH)3Cl R 3 3 Clinoatacamite! Cu2(OH)3Cl P 21/n 2/m Herbertsmithite! Cu3Zn(OH)6Cl2 R 3m 3 2/m Kapellasite! Cu3Zn(OH)6Cl2 P 3m1 3 2/m
Help on  Strunz Class: Strunz Class: 03.DA.10b 03 - HALIDES
  03.D - Oxyhalides, Hydroxyhalides and Related Double Halides
  03.DA -With Cu, etc., without Pb
03.DA.10b Botallackite Cu2Cl(OH)3 P 21/m 2/m
03.DA.10b Clinoatacamite! Cu2(OH)3Cl P 21/n 2/m
03.DA.10b Belloite! Cu(OH)Cl P 21/a 2/m

Other Clinoatacamite Information

Help on References: References: NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.81,p1282,1996) OPTIC PROP.(MinRec)
Help on See Also: See Also: Links to other databases for Clinoatacamite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Dana No: Strunz No: 03.DA.10b





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