Botallackite Mineral Data

Botallackite Mineral Data +

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General Botallackite Information

Chemical Formula:

Cu2Cl(OH)3

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:

Cu₂Cl(OH)₃

Environment:

In copper-bearing deposits, in areas with high chlorine concentrations or weathered while exposed to seawater; a reaction product of slag immersed in seawater.

IMA Status:

Valid Species (Pre-IMA) 1865

Locality:

In the Wheal Cock and West Wheal Owles, the Botallack and Levant mines, St. Just, and a few other places in Cornwall, England. Link to MinDat.org Location Data.

Name Origin:

For the occurrence in the Botallack mine, Cornwall, England.

Synonym:

ICSD 71001

PDF Aug-88

Botallackite Image

Images:

Botallackite

Comments: Well crystallized (although the crystals are small) botallackite on matrix.
Location: A European classic from the type locality, Botallack mine, St Just, England. Scale: 5 x 4 cm.
© Fabre Minerals

Botallackite Crystallography

Axial Ratios:

a:b:c =0.9329:1:0.9193

Cell Dimensions:

a = 5.715, b = 6.126, c = 5.632, Z = 2; beta = 93.07° V = 196.89 Den(Calc)= 3.60

Crystal System:

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

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

By Intensity(I/I_o): 5.66(1), 2.4(0.8), 2.57(0.7),

Crystal Structure:

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drag2 - RMB Resize/Rotate
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Hawthorne F C , Mineralogical Magazine , 49 (1985) p.87-89, Refinement of the crystal structure of botallackite, Locality: Botallack mine, Cornwall, England

Physical Properties of Botallackite

Cleavage:

[100] Perfect

Color:

Blue green, Green, Light blue green, Light green.

Density:

3.6

Streak:

light green

Optical Properties of Botallackite

Gladstone-Dale:

CI meas= -0.009 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.009 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2242,KPDmeas= 0.2242,KC= 0.2221

Optical Data:

Biaxial (+), a=1.775, b=1.8, g=1.846, bire=0.0710

Calculated Properties of Botallackite

Electron Density:

r_electron=3.44 gm/cc
note: r_Botallackite=3.60 gm/cc.

Fermion Index

Fermion Index = 0.00011
Boson Index = 0.99989

Photoelectric:

PE_Botallackite= 27.37 barns/electron
U=PE_Botallackite x r_electron= 94.12 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Botallackite is Not Radioactive

Botallackite Classification

Dana Class:

10.1.3.1 (10)Oxyhalides and Hydroxyhalides

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

(10.1.3)Dana Group

10.1.3.1 Botallackite Cu2Cl(OH)3 P 2₁/m 2/m

Strunz Class:

III/D.01-50 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 Botallackite Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Print or Cut-and-Paste your Botallackite Specimen Label here :

Botallackite

Cu2Cl(OH)3
Dana No: 10.1.3.1 Strunz No: III/D.01-50
Locality:

Notes: