Methane hydrate-II Mineral Data

General Methane hydrate-II Information

Chemical Formula:

136(H2O)•16(S)•8(L)

Composition:

Molecular Weight = 2,947.32 gm

Hydrogen 13.13 % H

Carbon 13.04 % C

Oxygen 73.83 % O

______

100.00 %

Empirical Formula:

•136(H₂O)16(CH4)8(C2H6)

Environment:

4 - 5 deg C and 50 atmospheres. Type I structure where S=CH4,H2S L=CH4,H2S,CO2,C2H6. Found in subsurface gas hydrate deposits.

IMA Status:

Not Submitted IMA (Dana # Added)

Locality:

World wide. Link to MinDat.org Location Data.

Name Origin:

Named for the composition of the component chemicals.

Synonym:

Methane Clathrate

Methane hydrate

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Methane hydrate-II Crystallography

Cell Dimensions:

a = 17.3, Z = 1; V = 5,177.72 Den(Calc)= 0.95

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F d3m

Physical Properties of Methane hydrate-II

Cleavage:

None

Color:

White, Yellow white.

Density:

0.95

Diaphaneity:

Transparent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Crystalline - Coarse - Occurs as well-formed coarse sized crystals.

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Hardness:

2.5 - Finger Nail

Luster:

Vitreous - Dull

Streak:

white

Optical Properties of Methane hydrate-II

Optical Data:

Uniaxial (?), a=1.3, b=1.3, bire=0.0000.

Calculated Properties of Methane hydrate-II

Electron Density:

Bulk Density (Electron Density)=1.07 gm/cc
note: Specific Gravity of Methane hydrate-II =0.95 gm/cc.

Fermion Index:

Fermion Index = 0.0018085486
Boson Index = 0.9981914514

Photoelectric:

PE_{Methane hydrate-II}= 0.31 barns/electron
U=PE_{Methane hydrate-II} x rElectron Density= 0.33 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Methane hydrate-II is Not Radioactive

Methane hydrate-II Classification

Dana Class:

04.01.03.02 (04)Simple Oxides

(04.01)with a cation charge of 1+ (A+2 O)

(04.01.03)Gas Hydrate Group

04.01.03.01 Methane hydrate-I! 46(H2O)•2(S)•6(L) P m3n 4/m 3 2/m

04.01.03.02 Methane hydrate-II! 136(H2O)•16(S)•8(L) F d3m 4/m 3 2/m

04.01.03.03 Methane hydrate-H! 34(H2O)•3(S)•2(M)•1(L) P 6/mmm 6/m 2/m 2/m

Strunz Class:

04.XX.00 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.X - Unclassified Strunz OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, telluri

04.XX -Oxide

04.XX.00 Ashanite? (Nb,Ta,U,Fe,Mn)4O8 Pcan 2/m 2/m 2/m

04.XX.00 Methane hydrate-I! 46(H2O)•2(S)•6(L) P m3n 4/m 3 2/m

04.XX.00 Clinobirnessite* Na4Mn14O27•9(H2O) Mono

04.XX.00 Chubutite* Pb7O6Cl2 Unk Ortho

04.XX.00 Kleberite* FeTi6O13•4(H2O)(?) P 6₃mcm ? 6mm

04.XX.00 Hongquiite* TiO F m3m 4/m 3 2/m

04.XX.00 Psilomelane? (Ba,H2O)2Mn5O10 A2/m 2/m

04.XX.00 Struverite? (Ti,Ta,Fe)O2 P 4/mnm 4/m 2/m 2/m

04.XX.00 Ungursaite* NaCa5(Ta,Nb)24O65(OH) P 6₃/m,P 6₃ Hex

04.XX.00 Uhligite? Ca3(Ti,Al,Zr)9O20 Unk Cubic

04.XX.00 Scheteligite? (Ca,Y,Sb,Mn)2(Ti,Ta,Nb,W)2O6(O,OH) Unk Ortho

04.XX.00 Allendeite! Sc4Zr3O12 R 3 3

04.XX.00 IMA2000-016! (Ti,Fe,Mg,Mn)1-xTi2O5 Pban 2/m 2/m 2/m

04.XX.00 Methane hydrate-II! 136(H2O)•16(S)•8(L) F d3m 4/m 3 2/m

04.XX.00 IMA2000-026! (Mn,Li)4(Ta,Sn)4(Ta,Nb)8O32 C 2/c 2/m

04.XX.00 Methane hydrate-H! 34(H2O)•3(S)•2(M)•1(L) P 6/mmm 6/m 2/m 2/m

Other Methane hydrate-II Information

References:

PHYS. PROP.(AmMin, v 89, p1155)

See Also:

Links to other databases for Methane hydrate-II :
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
10 - Ruff.Info

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Print or Cut-and-Paste your Methane hydrate-II Specimen Label here :

Methane hydrate-II

136(H2O)•16(S)•8(L)
Dana No: 04.01.03.02 Strunz No: 04.XX.00
Locality:

Notes: