Melanothallite Mineral Data

Melanothallite Mineral Data +

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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

IMA Status:

Valid Species (Pre-IMA) 1870

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 1055

PDF 35-679

Melanothallite Image

Images:

Click Here for Larger Melanothallite Image

Melanothallite Chloromenite

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 - DipyramidalH-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),

Crystal Structure:

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Krivovichev S V , Filatov S K , Burns P C , The Canadian Mineralogist , 40 (2002) p.1185-1190, The cuprite-like framework of OCu4 tetrahedra in the crystal structure, of synthetic melanothallite, Cu2OCl2, and its negative thermal expansion

Physical Properties of Melanothallite

Cleavage:

[???] Perfect

Color:

Bluish black, Greenish black, Black.

Density:

4.08

Luster:

Vitreous (Glassy)

Optical Properties of Melanothallite

Optical Data:

NCalc= 1.95 - from Gladstone-Dale relationship (KC = 0.2311) where Ncalc=Dcalc*KC+1
NCalc= 1.94 - from Gladstone-Dale relationship (KC = 0.2311) where Ncalc=Dmeas*KC+1

Calculated Properties of Melanothallite

Electron Density:

r_electron=3.83 gm/cc
note: r_{Melanothallite}=4.10 gm/cc.

Fermion Index

Fermion Index = 0.00003
Boson Index = 0.99997

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Melanothallite is Not Radioactive

Melanothallite Classification

Dana Class:

10.4.4.1 (10)Oxyhalides and Hydroxyhalides

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

(10.4.4)Dana Group

10.4.4.1 Melanothallite Cu2OCl2 F ddd 2/m 2/m 2/m

Strunz Class:

III/D.01-60 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 Melanothallite Information

References:

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Melanothallite

Cu2OCl2
Dana No: 10.4.4.1 Strunz No: III/D.01-60
Locality:

Notes: