Atacamite Mineral Data + Say ATACAMITE


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General Atacamite Information
Help on Chemical Formula: Chemical Formula: Cu2Cl(OH)3
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: Cu2Cl(OH)3
Help on Environment: Environment: Arid climates with oxidizable copper minerals.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1801
Help on Locality: Locality: Atacam desert province in northern Chile. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its locality.
Help on Synonym: Synonym: ICSD 61252
  PDF 25-269
  Paratacamite
 

Atacamite Image

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Atacamite

Comments: Atacamite in a well crystallized pocket.
Location: Mina Lily, Pisco Umay, Ica Dept. Peru. Scale: 5 x 4.5 cm.
© Fabre Minerals

Atacamite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.7491:1:0.6582
Help on Cell Dimensions: Cell Dimensions: a = 6.84, b = 9.13, c = 6.01, Z = 4; V = 375.32 Den(Calc)= 3.78
Help on Crystal System: Crystal System: Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pmcn
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.82(1), 5(1), 5.4(1),
Help on Forms: Forms:

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Forms: [ 1 1 0] [ 1 1 1] [ 0 1 1] [ 0 1 0]

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Click Here for Large Atacamite Structure Window Crystal Structure:

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Wells A F , Acta Crystallographica , 2 (1949) p.175-180, The crystal structure of atacamite and the crystal chemistry of, cupric compounds

View Additional jPOWD Structure files for Atacamite
[1]
 

Physical Properties of Atacamite

Help on Cleavage: Cleavage: [010] Perfect
Help on Color: Color: Green, Yellow, Yellow green, Black green.
Help on Density: Density: 3.76 - 3.78, Average = 3.76
Help on Diaphaniety: Diaphaniety: 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: Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Hardness: Hardness: 3-3.5 - Calcite-Copper Penny
Help on Luminescence: Luminescence: None.
Help on Luster: Luster: Adamantine
Help on Streak: Streak: apple green
 

Optical Properties of Atacamite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.024 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.021 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2268,KPDmeas= 0.2274,KC= 0.2221
Help on Optical Data: Optical Data: Biaxial (-), a=1.831, b=1.861, g=1.88, bire=0.0490, 2V(Calc)=74, 2V(Meas)=75. Dispersion strong, r < v.
 

Calculated Properties of Atacamite

Help on Electron Density: Electron Density:

relectron=3.61 gm/cc
note: rAtacamite =3.78 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.00011
Boson Index = 0.99989
Help on Photoelectric: Photoelectric:

PEAtacamite = 27.37 barns/electron
U=PEAtacamite x relectron= 98.83 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Atacamite is Not Radioactive
 

Atacamite Classification
Help on Dana Class: Dana Class: 10.1.1.1 (10)Oxyhalides and Hydroxyhalides
  (10.1)where (A)2 (O,OH)3 Xq
  (10.1.1)Dana Group
 
10.1.1.1 Atacamite Cu2Cl(OH)3 Pmcn 2/m 2/m 2/m
 
10.1.1.2 Hibbingite (Fe,Mg)2(OH)3Cl Pnam 2/m 2/m 2/m
Help on Strunz Class: Strunz Class: III/D.01-30 III - Halogenides
  III/D - Oxi-halogenides with Mg - Mn - Cu - Zn - Sn
  III/D.01 - Atacamite series, Korshunovskite - Anthonyite
 
III/D.01-10 Korshunovskite Mg2Cl(OH)3·3.5-4(H2O) P1 or P1 Tri
 
III/D.01-12 Nepskoeite! Mg4Cl(OH)7·6(H2O) Pcmm,Pcm2,Pc2m Ortho
 
III/D.01-15 Hibbingite (Fe,Mg)2(OH)3Cl Pnam 2/m 2/m 2/m
 
III/D.01-20 Kempite Mn2Cl(OH)3 Pnam 2/m 2/m 2/m
 
III/D.01-25 Belloite! Cu(OH)Cl P 21/a 2/m
 
III/D.01-30 Atacamite Cu2Cl(OH)3 Pmcn 2/m 2/m 2/m
 
III/D.01-40 Clinoatacamite! Cu2(OH)3Cl P 21/n 2/m
 
III/D.01-50 Botallackite Cu2Cl(OH)3 P 21/m 2/m
 
III/D.01-55 Paratacamite (Cu,Zn)2(OH)3Cl R 3 3
 
III/D.01-57 Herbertsmithite! Cu3Zn(OH)6Cl2 R 3m 3 2/m
 
III/D.01-60 Melanothallite Cu2OCl2 F ddd 2/m 2/m 2/m
 
III/D.01-65 Bobkingite! Cu5Cl2(OH)8(H2O)2 C 2/m 2/m
 
III/D.01-70 Calumetite Cu(OH,Cl)2·2(H2O) Unk Ortho
 
III/D.01-80 Anthonyite Cu(OH,Cl)2·3(H2O) Unk. Mono
 

Other Atacamite 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 Atacamite :
1 -Am. Min. Crystal Structure Database 2 - Amethyst Galleries' Mineral Gallery 3 - Applied Mineralogy 4 -Athena 5 - Crocoite.com Mineral Locations 6 - EUROmin Project 7 - Franklin Minerals(Dunn) 8 - Glendale Community College 9 -Google Images 10 -Google Scholar 11 -Handbook of Mineralogy (UofA) 12 -MinDAT 13 -MinMax(Deutsch) 14 -MinMax(English) 15 -Mineralienatlas (Deutsch) 16 - Philatelic Mineralogy 17 -QUT Mineral Atlas 18 - WWW-MINCRYST 19 - YupRocks 20 -theimage 21 -École des Mines de Paris

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Atacamite

Cu2Cl(OH)3
Dana No: 10.1.1.1 Strunz No: III/D.01-30
Locality:

 

Notes:

 
 
   
 
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