Clinoatacamite Mineral Data

Clinoatacamite Mineral Data

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General Clinoatacamite Information

Chemical Formula:

Cu2(OH)3Cl

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

Empirical Formula:

Cu₂(OH)₃Cl

Environment:

Secondary alteration product of copper ores.

IMA Status:

Approved IMA 1996 (Dana # Added)

Locality:

Chuquicamata, Chile. Link to MinDat.org Location Data.

Name Origin:

For the relationship to atacamite and paratacamite. Atacamite is named after the Atacam desert province in northern Chile.

Synonym:

ICSD 82485

IMA1993-060

PDF 25-1427

Clinoatacamite Image

Images:

Clinoatacamite

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

Axial Ratios:

a:b:c =0.9035:1:1.336

Cell Dimensions:

a = 6.157, b = 6.814, c = 9.104, Z = 4; beta = 99.65° V = 376.54 Den(Calc)= 3.77

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/n

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 5.47(1), 2.742(0.7), 2.767(0.6),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
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Grice J D , Szymanski J T , Jambor J L , The Canadian Mineralogist , 34 (1996) p.73-78, The crystal structure of clinoatacamite, a new polymorph of Cu2(OH)3Cl

Physical Properties of Clinoatacamite

Cleavage:

[012] Perfect

Color:

Green, Dark greenish black, Greenish blue.

Density:

3.71

Diaphaniety:

Transparent to translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Hardness:

3 - Calcite

Luminescence:

Non-fluorescent.

Luster:

Adamantine

Streak:

greenish white

Optical Properties of Clinoatacamite

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

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

Electron Density:

r_electron=3.60 gm/cc
note: r_{Clinoatacamite}=3.77 gm/cc.

Fermion Index

Fermion Index = 0.00011
Boson Index = 0.99989

Photoelectric:

PE_{Clinoatacamite}= 27.37 barns/electron
U=PE_{Clinoatacamite} x r_electron= 98.57 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Clinoatacamite is Not Radioactive

Clinoatacamite Classification

Dana Class:

10.1.2.2 (10)Oxyhalides and Hydroxyhalides

(10.1)where (A)2 (O,OH)3 Xq

(10.1.2)Dana Group

10.1.2.1 Paratacamite (Cu,Zn)2(OH)3Cl R 3 3

10.1.2.2 Clinoatacamite ! Cu2(OH)3Cl P 2₁/n 2/m

10.1.2.3 Herbertsmithite! Cu3Zn(OH)6Cl2 R 3m 3 2/m

Strunz Class:

III/D.01-40 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 Clinoatacamite Information

References:

NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.81,p1282,1996) OPTIC PROP.(MinRec)

See Also:

Links to other databases for Clinoatacamite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST

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Clinoatacamite

Cu2(OH)3Cl
Dana No: 10.1.2.2 Strunz No: III/D.01-40
Locality:

Notes: