Melanothallite Mineral Data

General Melanothallite Information

Chemical Formula:

Cu2OCl2

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

Empirical Formula:

Cu₂OCl₂

Environment:

Sublimed on crater walls formed in 1868 and 1906.

IMA Status:

Valid Species (Pre-IMA) 1870

Locality:

Vesuvius, Campania, Italy. Link to MinDat.org Location Data.

Name Origin:

Named from the Greek for black and a young shoot, for the mineral�s property of turning green on exposure.

Name Pronunciation:

Melanothallite + Pronunciation

Synonym:

ICSD 1055

PDF 35-679

Melanothallite Image

Images:

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

Images:

Melanothallite

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

Axial Ratios:

a:b:c =0.9898:1:0.7697

Cell Dimensions:

a = 9.595, b = 9.693, c = 7.461, Z = 8; V = 693.91 Den(Calc)= 4.10

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/I_o): 5.041(1), 2.518(0.77), 2.947(0.44),

Physical Properties of Melanothallite

Cleavage:

{???} Perfect

Color:

Bluish black, Greenish black, Black.

Density:

4.08

Luster:

Vitreous (Glassy)

Calculated Properties of Melanothallite

Electron Density:

Bulk Density (Electron Density)=3.83 gm/cc
note: Specific Gravity of Melanothallite =4.10 gm/cc.

Fermion Index:

Fermion Index = 0.000035887
Boson Index = 0.999964113

Photoelectric:

PE_{Melanothallite}= 28.99 barns/electron
U=PE_{Melanothallite} x rElectron Density= 111.09 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Melanothallite is Not Radioactive

Melanothallite Classification

Dana Class:

10.04.04.01 (10)Oxyhalides and Hydroxyhalides

(10.04)where (A)2 (O,OH) Xq

(10.04.04)Dana Group

10.04.04.01 Melanothallite Cu2OCl2 F ddd 2/m 2/m 2/m

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

References:

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

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

Melanothallite

Cu2OCl2
Dana No: 10.04.04.01 Strunz No: 03.DA.05
Locality:

Notes:

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