Mineralogy Database

Paratacamite Mineral Data

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General Paratacamite Information

Help on Chemical  Formula: Chemical Formula: (Cu,Zn)2(OH)3Cl
Help on Composition: Composition: Molecular Weight = 214.49 gm
   Zinc      15.24 %  Zn   18.97 % ZnO
   Copper    44.44 %  Cu   55.63 % CuO
   Hydrogen   1.41 %  H    12.60 % H2O
   Chlorine  16.53 %  Cl   16.53 % Cl
               -   %   Cl   -3.73 % -O=Cl2   
   Oxygen    22.38 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Cu1.5Zn0.5(OH)3Cl
Help on Environment: Environment: Alteration of copper minerals by chloride waters under cold conditions.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1873
Help on Locality: Locality: Generosa and Herminia mines, Sierra Gorda, Chile. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the dimorphous relationship with atacamite.
Help on Name Pronunciation: Name Pronunciation: Paratacamite + Pronunciation Say PARATACAMITE
Help on Synonym: Synonym: ICSD 64956
  PDF 25-325

Paratacamite Image

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  Christelite   Paratacamite

Comments: Robins-egg blue christelite with dark green paratacamite on matrix.
Location: San Francisco mine, Sierra Gorda, Chile. Scale: 3 cm.
© John Veevaert

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Comments: Deep green crystal paratacamite rosettes on rusty quartz.
Location: Churchill Butte, Lyon County, Nevada, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Paratacamite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.02834
Help on Cell Dimensions: Cell Dimensions: a = 13.654, c = 14.041, Z = 24; V = 2,266.98 Den(Calc)= 3.77
Help on Crystal System: Crystal System: Trigonal - Rhombohedral H-M Symbol ( 3) Space Group: R 3
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 5.44(1), 2.27(0.8), 2.74(0.6),2.76(0.6), 2.78(0.5), 1.71(0.5), 2.9(0.3),

Physical Properties of Paratacamite

Help on Cleavage: Cleavage: {1011} Good
Help on Color: Color: Greenish black, Dark green.
Help on Density: Density: 3.74
Help on Diaphaneity: Diaphaneity: Translucent to Subopaque
Help on Fracture: Fracture: Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.
Help on Habit: Habit: Encrustations - Forms crust-like aggregates on matrix.
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Habit: Habit: Rhombohedral Crystals - Occurs as well-formed crystals showing rhobohedral crystals.
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Vitreous - Dull
Help on Streak: Streak: light green

Optical Properties of Paratacamite

Help on Dichroism (e): Dichroism (e): none.
Help on Dichroism (w): Dichroism (w): none.
Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.029 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.021 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2243,KPDmeas= 0.2261,KC= 0.2196
Ncalc = 1.82 - 1.83
Help on Optical Data: Optical Data: Uniaxial (+), w=1.843, e=1.848, bire=0.0050.

Calculated Properties of Paratacamite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.60 gm/cc
note: Specific Gravity of Paratacamite =3.77 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0063592515
Boson Index = 0.9936407485
Help on Photoelectric: Photoelectric: PEParatacamite = 28.34 barns/electron
U=PEParatacamite x rElectron Density= 102.10 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Paratacamite is Not Radioactive

Paratacamite 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.10c 03 - HALIDES
  03.D - Oxyhalides, Hydroxyhalides and Related Double Halides
  03.DA -With Cu, etc., without Pb
03.DA.10c Paratacamite (Cu,Zn)2(OH)3Cl R 3 3
03.DA.10c Gillardite! Cu3NiCl2(OH)6 R 3m 3
03.DA.10c Herbertsmithite! Cu3Zn(OH)6Cl2 R 3m 3 2/m
03.DA.10c Kapellasite! Cu3Zn(OH)6Cl2 P 3m1 3 2/m
03.DA.10c Haydeeite! Cu3Mg(OH)6Cl2 R 3m 3

Other Paratacamite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(AntBidBlaNic3) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Paratacamite :
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: 03.DA.10c





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