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Tolbachite Mineral Data

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General Tolbachite Information

Help on Chemical  Formula: Chemical Formula: CuCl2
Help on Composition: Composition: Molecular Weight = 134.45 gm
   Copper    47.26 %  Cu   59.16 % CuO
   Chlorine  52.74 %  Cl   52.74 % Cl
               -   %  Cl  -11.90 % -O=Cl2   
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CuCl2
Help on Environment: Environment: In fumaroles associated with melanothallite. Alters quickly to eriochalcite.
Help on IMA Status: IMA Status: Approved IMA 1983
Help on Locality: Locality: Tolbachik volcano, Kamchatka, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Tolbachite + Pronunciation Say TOLBACHITE
Help on Synonym: Synonym: ICSD 66645
  PDF 35-690

Tolbachite Image

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Comments: Small orange-brownish crystals of tolbachite.
Location: Tolbachik volcano, Kamchatka Oblast', Far-Eastern Region, Russia. Scale: Picture size 2.5 mm.
© Thomas Witzke / Abraxas-Verlag

Tolbachite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.0815:1:2.0604
Help on Cell Dimensions: Cell Dimensions: a = 6.89, b = 3.31, c = 6.82, Z = 2; beta = 122.3° V = 131.47 Den(Calc)= 3.40
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 5.76(1), 2.915(0.35), 3.445(0.25),

Physical Properties of Tolbachite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Brown, Golden brown.
Help on Density: Density: 3.42
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Deliquescent - Crystals absorb water from the air and melt or otherwise deteriorate.
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Habit: Habit: Mossy - Like moss in form or appearance.

Optical Properties of Tolbachite

Help on Optical Data: Optical Data: Biaxial (?)
Help on Pleochroism (x): Pleochroism (x): pale green.
Help on Pleochroism (z): Pleochroism (z): dark brown.

Calculated Properties of Tolbachite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.19 gm/cc
note: Specific Gravity of Tolbachite =3.40 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0
Boson Index = 1
Help on Photoelectric: Photoelectric: PETolbachite = 24.79 barns/electron
U=PETolbachite x rElectron Density= 79.00 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Tolbachite is Not Radioactive

Tolbachite Classification

Help on  Dana Class: Dana Class: (09)Anhydrous and Hydrated Halides
  (09.02)where A (X)2
  (09.02.08)Dana Group Eriochalcite CuCl2•2(H2O) Pbmn 2/m 2/m 2/m Tolbachite CuCl2 C 2/m 2/m
Help on  Strunz Class: Strunz Class: 03.AB.05 03 - HALIDES
  03.A - Simple Halides, Without H2O
  03.AB -M:X = 1:2
03.AB.05 Tolbachite CuCl2 C 2/m 2/m

Other Tolbachite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Tolbachite :
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.AB.05





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