Melanophlogite Mineral Data

General Melanophlogite Information

Chemical Formula:

SiO2•n(C,H,O,S)

Composition:

Molecular Weight = 2,929.11 gm

Silicon 44.11 % Si 94.36 % SiO₂

Hydrogen 0.78 % H 6.95 % H₂O

Carbon 0.82 % C

Sulfur 0.55 % S 1.09 % SO₂

Oxygen 53.75 % O

______ ______

100.00 % 102.40 % = TOTAL OXIDE

Empirical Formula:

46(SiO₂)C₂H_22.6O_5.4(SO₂)_0.5

Environment:

A late-stage, low-temperature mineral with large, clathrate voids which host CH4, CO2, and N2. Stable below 40-65 deg. C.

IMA Status:

Valid Species (Pre-IMA) 1876

Locality:

In Italy, at Solfatara Giona, Racalmuto, and at Caltanissetta, Sicily. Link to MinDat.org Location Data.

Name Origin:

From the Greek for "black" and "to be burned" in allusion to the fact that some specimens blacken on heating. Low temperature form.

Name Pronunciation:

Melanophlogite + Pronunciation

Synonym:

ICSD 30791

Melanophlogite-alpha

PDF 27-7

Melanophlogite Image

Images:

Melanophlogite

Comments: Yellow, transparent Melanophlogite crystals.
Location: Racalmuto, Sicily, Italy. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Melanophlogite Crystallography

Axial Ratios:

a:c = 1:0.5

Cell Dimensions:

a = 26.79, c = 13.395, Z = 4; V = 9,613.65 Den(Calc)= 2.02

Crystal System:

Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: P 4₁/nbc

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 5.99(1), 3.58(0.9), 5.471(0.7),

Physical Properties of Melanophlogite

Cleavage:

None

Color:

Brown, Colorless, Light yellow, Dark reddish brown.

Density:

1.99 - 2.11, Average = 2.04

Diaphaneity:

Transparent to Translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Hardness:

6.5-7 - Pyrite-Quartz

Luminescence:

Fluorescent, Short UV=weak gray-white, Long UV=gray-white.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Melanophlogite

Gladstone-Dale:

CI meas= 0.034 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.02 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2183,KPDmeas= 0.2151,KC= 0.2228
Ncalc = 1.44 - 1.47

Optical Data:

Isotropic, n=1.425-1.457.

Calculated Properties of Melanophlogite

Electron Density:

Bulk Density (Electron Density)=2.03 gm/cc
note: Specific Gravity of Melanophlogite =2.02 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_{Melanophlogite}= 1.73 barns/electron
U=PE_{Melanophlogite} x rElectron Density= 3.51 barns/cc.

Radioactivity:

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

Melanophlogite Classification

Dana Class:

75.02.02.01 (75)Tectosilicate Si Tetrahedral Frameworks

(75.02)SiO2 with H2O and organics

(75.02.02)Melanophlogite Polymorphs

75.02.02.01 Melanophlogite SiO2•n(C,H,O,S) P 4₁/nbc 4/m 2/m 2/m

75.02.02.02 Melanophlogite-beta! SiO2•n(C,H,O,S) P m3n 4/m 3 2/m

75.02.02.03 IMA2008-067! SiO2•n(CH4,C2H6,C3H8,C4H10);(nmax=3/17) Fd3 2/m 3

Strunz Class:

04.DA.25 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.D - Metal:Oxygen = 1:2 and similar

04.DA -With small cations

04.DA.25 Melanophlogite SiO2•n(C,H,O,S) P 4₁/nbc 4/m 2/m 2/m

04.DA.25 IMA2008-067! SiO2•n(CH4,C2H6,C3H8,C4H10);(nmax=3/17) Fd3 2/m 3

04.DA.25 Melanophlogite-beta! SiO2•n(C,H,O,S) P m3n 4/m 3 2/m

Other Melanophlogite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic2)

See Also:

Links to other databases for Melanophlogite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineral and Gemstone Kingdom
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - WWW-MINCRYST
18 - Zeolite Database by Bruno Herreros

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

Melanophlogite

SiO2•n(C,H,O,S)
Dana No: 75.02.02.01 Strunz No: 04.DA.25
Locality:

Notes:

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