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 DipyramidalH-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),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Nakagawa T , Kihara K , Harada K , American Mineralogist , 86 (2001) p.1506-1512, The crystal structure of low melanophlogite

View Additional jPOWD Structure files for Melanophlogite
[1]

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

Search for Melanophlogite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Melanophlogite :

A Bijoux Google Search for Melanophlogite
Adam's Minerals Google Search for Melanophlogite
Cape Minerals Google Search for Melanophlogite
Dakota Matrix Minerals Google Search for Melanophlogite
Excalibur Mineral Corp. Google Search for Melanophlogite
Exceptional Minerals Google Search for Melanophlogite
John Betts Fine Minerals Search for Melanophlogite
McDougall Minerals Google Search for Melanophlogite
Mineral News Website Link
Rock and Mineral Shows Google Search for Melanophlogite
Weinrich Minerals, Inc. Google Search for Melanophlogite

Ask about Melanophlogite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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: