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Herbertsmithite Mineral Data

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General Herbertsmithite Information

Help on Chemical  Formula: Chemical Formula: Cu3Zn(OH)6Cl2
Help on Composition: Composition: Molecular Weight = 430.25 gm
   Zinc      14.59 %  Zn   18.16 % ZnO
   Copper    44.75 %  Cu   56.02 % CuO
   Hydrogen   1.39 %  H    12.46 % H2O
   Chlorine  17.14 %  Cl   17.14 % Cl
               -   %   Cl   -3.87 % -O=Cl2   
   Oxygen    22.13 %  O
            ______        ______ 
            100.00 %       99.91 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Cu3.03Zn0.96(OH)5.95Cl2.08
Help on Environment: Environment: On a white quartzite, (2) In limonite gossan with wulfenite crystalsrosasite. (3) On joint surfaces of metamorphosed dolomitic limestone. Related to paratacamite.
Help on IMA Status: IMA Status: Approved IMA 2003 (Dana # Added)
Help on Locality: Locality: Mina Los Tres Presidentes, Sierra Gorda, Chile (type locality). Also from (2) the Kali Kafi mine, Anarak, Iran and from (3) the Chah Khouni mine, Anarak, Iran Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for G.F. Herbert Smith (1872-1953), of the British Museum (Natural History), who discovered paratacamite.
Help on Synonym: Synonym: IMA2003-041

Herbertsmithite Image

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Comments: Black and white image of dark green herbertsmithite crystals on pale buff matrix. (Mineralogical Magazine, 68:5310.
Location: Mina Los Tres Presidentes, Sierra Gorda, Chile.. Scale: See Image.
© Mineralogical Magazine

Herbertsmithite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:2.05955
Help on Cell Dimensions: Cell Dimensions: a = 6.834, c = 14.075, Z = 3; V = 569.28 Den(Calc)= 3.76
Help on Crystal System: Crystal System: Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: R 3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.764(1)(113), 5.466(0.55)(101), 2.266(0.36)(204),1.709(0.18)(220), 4.702(0.14)(003), 1.82(0.13)(303), 2.73(0.13)(202), 2.899(0.11),

Physical Properties of Herbertsmithite

Help on Cleavage: Cleavage: {101} Good
Help on Color: Color: Dark green, Blue green.
Help on Density: Density: 3.75 - 3.95, Average = 3.85
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Rhombohedral Crystals - Occurs as well-formed crystals showing rhobohedral crystals.
Help on Hardness: Hardness: 3-3.5 - Calcite-Copper Penny
Help on Luster: Luster: Vitreous - Adamantine
Help on Streak: Streak: green

Optical Properties of Herbertsmithite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.033 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.009 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2184,KPDmeas= 0.2132,KC= 0.2204
Ncalc = 1.83 - 1.87
Help on Optical Data: Optical Data: Uniaxial (-), e=1.817, w=1.825, bire=0.0080.

Calculated Properties of Herbertsmithite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.59 gm/cc
note: Specific Gravity of Herbertsmithite =3.76 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0060902254
Boson Index = 0.9939097746
Help on Photoelectric: Photoelectric: PEHerbertsmithite = 28.19 barns/electron
U=PEHerbertsmithite x rElectron Density= 101.29 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Herbertsmithite is Not Radioactive

Herbertsmithite 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 Herbertsmithite Information

Help on References: References: NAME( CanMin, 42:1909) PHYS. PROP.(CanMin, 42:1909) OPTIC PROP.(CanMin, 42:1909)
Help on See Also: See Also: Links to other databases for Herbertsmithite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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





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