Melanophlogite-beta Mineral Data

Melanophlogite-beta Mineral Data +

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General Melanophlogite-beta 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 above 40-65 deg. C.

IMA Status:

Not approved IMA (Dana # Added)

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. High temperature form.

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Melanophlogite-beta Crystallography

Cell Dimensions:

a = 13.436, Z = 1; V = 2,425.55 Den(Calc)= 2.01

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: P m3n

Physical Properties of Melanophlogite-beta

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

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Melanophlogite-beta

Gladstone-Dale:

CI meas= 0.034 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.015 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2194,KPDmeas= 0.2151,KC= 0.2228

Optical Data:

Isotropic, n=1.425-1.457.

Calculated Properties of Melanophlogite-beta

Electron Density:

r_electron=2.02 gm/cc
note: r_{Melanophlogite-beta}=2.01 gm/cc.

Fermion Index

Fermion Index = 0.02098
Boson Index = 0.97902

Photoelectric:

PE_{Melanophlogite-beta}= 1.73 barns/electron
U=PE_{Melanophlogite-beta} x r_electron= 3.50 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Melanophlogite-beta is Not Radioactive

Melanophlogite-beta Classification

Dana Class:

75.2.2.2 (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-beta Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(AmMin, Vol 86, p 1506-1512) OPTIC PROP.(AntBidBlaNic2)

See Also:

Links to other databases for Melanophlogite-beta :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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

Melanophlogite-beta

SiO2·n(C,H,O,S)
Dana No: 75.2.2.2 Strunz No: IV/D.01-40*
Locality:

Notes: