Mineralogy Database

Melanothallite Mineral Data

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General Melanothallite Information

Help on Chemical  Formula: Chemical Formula: Cu2OCl2
Help on Composition: Composition: Molecular Weight = 214.00 gm
   Copper    59.39 %  Cu   74.34 % CuO
   Chlorine  33.13 %  Cl   33.13 % Cl
               -   %   Cl   -7.48 % -O=Cl2   
   Oxygen     7.48 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Cu2OCl2
Help on Environment: Environment: Sublimed on crater walls formed in 1868 and 1906.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1870
Help on Locality: Locality: Vesuvius, Campania, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named from the Greek for black and a young shoot, for the mineral�s property of turning green on exposure.
Help on Name Pronunciation: Name Pronunciation: Melanothallite + Pronunciation Say MELANOTHALLITE
Help on Synonym: Synonym: ICSD 1055
  PDF 35-679

Melanothallite Image

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  Chloromenite   Melanothallite

Comments: Olive green crystalline chloromenite on blue-green melanothallite.
Location: North Break, Second Cone of main fracture eruption, Tolbachik Volcano, Kamchatka District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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Comments: Bluish green melanothallite grain.
Location: North Break, Second Cone, Main Eruption Site, Tolbachik, Kamchatka District, Russian Far East, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Melanothallite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9898:1:0.7697
Help on Cell Dimensions: Cell Dimensions: a = 9.595, b = 9.693, c = 7.461, Z = 8; V = 693.91 Den(Calc)= 4.10
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: F ddd
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 5.041(1), 2.518(0.77), 2.947(0.44),

Physical Properties of Melanothallite

Help on Cleavage: Cleavage: {???} Perfect
Help on Color: Color: Bluish black, Greenish black, Black.
Help on Density: Density: 4.08
Help on Luster: Luster: Vitreous (Glassy)

Calculated Properties of Melanothallite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.83 gm/cc
note: Specific Gravity of Melanothallite =4.10 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.000035887
Boson Index = 0.999964113
Help on Photoelectric: Photoelectric: PEMelanothallite = 28.99 barns/electron
U=PEMelanothallite x rElectron Density= 111.09 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Melanothallite is Not Radioactive

Melanothallite Classification

Help on  Dana Class: Dana Class: (10)Oxyhalides and Hydroxyhalides
  (10.04)where (A)2 (O,OH) Xq
  (10.04.04)Dana Group Melanothallite Cu2OCl2 F ddd 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 03.DA.05 03 - HALIDES
  03.D - Oxyhalides, Hydroxyhalides and Related Double Halides
  03.DA -With Cu, etc., without Pb
03.DA.05 Melanothallite Cu2OCl2 F ddd 2/m 2/m 2/m

Other Melanothallite Information

Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Melanothallite :
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.DA.05





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