Melanophlogite Mineral Data

Melanophlogite Mineral Data +

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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.

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

Diaphaniety:

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.

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

Optical Data:

Isotropic, n=1.425-1.457.

Calculated Properties of Melanophlogite

Electron Density:

r_electron=2.03 gm/cc
note: r_{Melanophlogite}=2.02 gm/cc.

Fermion Index

Fermion Index = 0.02098
Boson Index = 0.97902

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Melanophlogite is Not Radioactive

Melanophlogite Classification

Dana Class:

75.2.2.1 (75)Tectosilicate Si Tetrahedral Frameworks

(75.2)SiO2 with H2O and organics

(75.2.2)Melanophlogite Polymorphs

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

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

Strunz Class:

IV/D.01-40 IV - Oxides

IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds)

IV/D.01 - Quartz group

IV/D.01-10 Quartz SiO2 P 3₁21,P 3₂21 3 2

IV/D.01-20 Tridymite SiO2 F1 1

IV/D.01-30 Cristobalite SiO2 P 4₁2₁2 4 2 2

IV/D.01-35 Moganite! SiO2 I2/a 2/m

IV/D.01-40 Melanophlogite SiO2·n(C,H,O,S) P 4₁/nbc 4/m 2/m 2/m

IV/D.01-40* Melanophlogite-beta! SiO2·n(C,H,O,S) P m3n 4/m 3 2/m

IV/D.01-50 Coesite SiO2 C 2/c 2/m

IV/D.01-60 Stishovite SiO2 P 4/mnm 4/m 2/m 2/m

IV/D.01-70 Lechatelierite* SiO2 None

IV/D.01-80 Opal SiO2·n(H2O) None

Other Melanophlogite Information

References:

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

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

Melanophlogite

SiO2·n(C,H,O,S)
Dana No: 75.2.2.1 Strunz No: IV/D.01-40
Locality:

Notes: