Mineralogy Database

Eriochalcite Mineral Data

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General Eriochalcite Information

Help on Chemical  Formula: Chemical Formula: CuCl2•2(H2O)
Help on Composition: Composition: Molecular Weight = 170.48 gm
   Copper    37.27 %  Cu   46.66 % CuO
   Hydrogen   2.36 %  H    21.13 % H2O
   Chlorine  41.59 %  Cl   41.59 % Cl
               -   %   Cl   -9.38 % -O=Cl2   
   Oxygen    18.77 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CuCl2•2(H2O)
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1884
Help on Locality: Locality: Monte Somma, Vesuvius, Naples Province, Campania, Italy Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek erion = "wool" and kalcos= "copper", in allusion to its form and to the chemical composition.
Help on Name Pronunciation: Name Pronunciation: Eriochalcite + Pronunciation Say ERIOCHALCITE
Help on Synonym: Synonym: ICSD 34239
  PDF 33-451

Eriochalcite Image

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Comments: Green grains of eriochalcite from the eruption of 1875, Vesuvius volcano.
Location: Vesuvius volcano. Vesuvius, Naples, Naples province, Campania, Italy. Scale: Picture size 3 mm.
© Thomas Witzke / Abraxas-Verlag

Eriochalcite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9179:1:0.4626
Help on Cell Dimensions: Cell Dimensions: a = 7.38, b = 8.04, c = 3.72, Z = 2; V = 220.73 Den(Calc)= 2.56
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pbmn
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 5.44(1), 4.02(0.14), 2.637(0.1),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 0 1 0) ( 5 2 0) ( 3 0 1) ( 1 1 1) ( 1 1 0) ( 1 0 0) ( 0 0 1)

Warning: this java applet does not work in some browsers because of security restrictions.


Physical Properties of Eriochalcite

Help on Cleavage: Cleavage: {110} Perfect, {001} Good
Help on Color: Color: Blue green, Green blue.
Help on Density: Density: 2.47
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luster: Luster: Vitreous (Glassy)

Optical Properties of Eriochalcite

Help on Optical Data: Optical Data: Biaxial (+), a=1.646, b=1.685, g=1.745, bire=0.0990, 2V(Calc)=82, 2V(Meas)=75.

Calculated Properties of Eriochalcite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.49 gm/cc
note: Specific Gravity of Eriochalcite =2.56 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0000936415
Boson Index = 0.9999063585
Help on Photoelectric: Photoelectric: PEEriochalcite = 18.91 barns/electron
U=PEEriochalcite x rElectron Density= 47.13 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Eriochalcite is Not Radioactive

Eriochalcite 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.BB.05 03 - HALIDES
  03.B - Simple Halides, with H2O
  03.BB -M:X = 1:2
03.BB.05 Eriochalcite CuCl2•2(H2O) Pbmn 2/m 2/m 2/m

Other Eriochalcite Information

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





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