Chibaite
A valid IMA mineral species
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About Chibaite
Flag of Chiba Prefecture, Japan
Formula:
SiO2 · n(CH4, C2H6, C3H8, i-C4H10) (n = 3/17 (max))
Alternatively it can be given as Nax(Si136−xAlx)Σ136O272·(CH4, C2H6, C3H8, C4H10)24−x
Colour:
Colorless
Lustre:
Vitreous
Hardness:
6½ - 7
Specific Gravity:
1.933 (Calculated)
Crystal System:
Isometric
Member of:
Name:
Named for Chiba Prefecture, Japan, that includes the type locality.
Type Locality:
Natural analogue of synthetic clathrate MTN with hydrocarbon molecules such as methane, ethane, propane, and 2-methyl-propane contained in its cage-like voids.
Also described as a clathrasil. Compare the other natural clathrasils: bosoite and melanophlogite.
Also described as a clathrasil. Compare the other natural clathrasils: bosoite and melanophlogite.
Unique Identifiers
Mindat ID:
39335
Long-form identifier:
mindat:1:1:39335:9
Similar Names
| Shabaite-(Nd) | A valid IMA mineral species | Nd2Ca[(UO2)(CO3)3](CO3)2(H2O)10.5 |
IMA Classification of Chibaite
Classification of Chibaite
4.DA.
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
A : With small cations: Silica family
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
A : With small cations: Silica family
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Cib | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Chibaite
Vitreous
Colour:
Colorless
Streak:
White
Hardness:
6½ - 7 on Mohs scale
Cleavage:
None Observed
Density:
1.933 g/cm3 (Calculated)
Optical Data of Chibaite
Type:
Isotropic
RI values:
n = 1.470(1)
Surface Relief:
Moderate (negative)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Chemistry of Chibaite
Mindat Formula:
SiO2 · n(CH4, C2H6, C3H8, i-C4H10) (n = 3/17 (max))
Alternatively it can be given as Nax(Si136−xAlx)Σ136O272·(CH4, C2H6, C3H8, C4H10)24−x
Alternatively it can be given as Nax(Si136−xAlx)Σ136O272·(CH4, C2H6, C3H8, C4H10)24−x
Element Weights:
Elements listed:
Crystallography of Chibaite
Crystal System:
Isometric
Class (H-M):
m3(2/m3) - Diploidal
Space Group:
Fd3
Setting:
F2/d3
Cell Parameters:
a = 19.3742(4) Å
Unit Cell V:
7,272.29 ų (Calculated from Unit Cell)
Z:
4
Morphology:
As equant crystals displaying {111} and {100}.
Twinning:
Spinel law.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 11.210 Å | (24) |
| 6.858 Å | (38) |
| 5.847 Å | (83) |
| 4.847 Å | (24) |
| 3.956 Å | (25) |
| 3.730 Å | (91) |
| 3.426 Å | (40) |
| 3.276 Å | (100) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 3b: Earth’s earliest hydrosphere | >4.45 |
| 17 : Marine authigenic Hadean minerals (see also #24) |
Type Occurrence of Chibaite
General Appearance of Type Material:
As equant crystals; epitaxially intergrown with DOH-type silicate clathrate.
Place of Conservation of Type Material:
Mineral Collection, Tohoku University Museum, Sendai, Japan, A-151.
Geological Setting of Type Material:
In marine sediments of Early Miocene age.
Synonyms of Chibaite
Other Language Names for Chibaite
Relationship of Chibaite to other Species
Member of:
Other Members of Silica:
| Coesite | SiO2 | Mon. 2/m : B2/b |
| Cristobalite | SiO2 | Tet. 422 : P41212 |
| 'Keatite' | SiO2 | Tet. 422 : P43212 |
| Lechatelierite | SiO2 | Amor. |
| Melanophlogite | 46SiO2 · 6(N2,CO2) · 2(CH4,N2) | Tet. 4/mmm(4/m2/m2/m) |
| Mogánite | SiO2 | Mon. 2/m |
| 'Opal-AG' | SiO2 · nH2O | |
| 'Opal-AN' | SiO2 · nH2O | |
| 'Opal-C' | SiO2 · nH2O | |
| 'Opal-CT' | SiO2 · nH2O | |
| Quartz | SiO2 | Trig. 32 : P3121 |
| 'Quartz-beta' | SiO2 | Hex. 622 : P6422 |
| Stishovite | SiO2 | Tet. 4/mmm(4/m2/m2/m) : P42/mnm |
| Tridymite | SiO2 | Tric. 1 |
| 'β-Cristobalite' | SiO2 | Iso. m3m(4/m32/m) : Fd3m |
| 'β-Tridymite' | SiO2 |
Common Associates
Associations Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 4.DA. | Bosoite | SiO2 · nCxH2x+2 |
| 4.DA. | 'Carbon Dioxide Ice' | CO2 |
| 4.DA.05 | Quartz | SiO2 |
| 4.DA.10 | Tridymite | SiO2 |
| 4.DA.10 | Opal | SiO2 · nH2O |
| 4.DA.15 | Cristobalite | SiO2 |
| 4.DA.20 | Mogánite | SiO2 |
| 4.DA.25 | Melanophlogite | 46SiO2 · 6(N2,CO2) · 2(CH4,N2) |
| 4.DA.30 | Lechatelierite | SiO2 |
| 4.DA.35 | Coesite | SiO2 |
| 4.DA.35 | Xiexiandeite | SiO2 |
| 4.DA.40 | Stishovite | SiO2 |
| 4.DA.45 | 'Keatite' | SiO2 |
| 4.DA.50 | Seifertite | SiO2 |
| 4.DA.55 | 'Quartz-beta' | SiO2 |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Chibaite
mindat.org URL:
https://www.mindat.org/min-39335.html
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Please feel free to link to this page.
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External Links:
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References for Chibaite
Reference List:
Momma, Koichi; Ikeda, Takuji; Nishikubo, Katsumi; Takahashi, Naoki; Honma, Chibune; Takada, Masayuki; Furukawa, Yoshihiro; Nagase, Toshiro; Kudoh, Yasuhiro (2011) New silica clathrate minerals that are isostructural with natural gas hydrates. Nature Communications, 2 (1). 196 doi:10.1038/ncomms1196
Likhacheva, Anna Yu., Goryainov, Sergey V., Seryotkin, Yuriy V., Litasov, Konstantin D., Momma, Koichi (2016) Raman spectroscopy of chibaite, natural MTN silica clathrate, at high pressure up to 8 GPa. Microporous and Mesoporous Materials, 224. 100-106 doi:10.1016/j.micromeso.2015.11.033
Localities for Chibaite
Showing 2 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Japan (TL) | |
| Momma et al. (2011) +3 other references |
| Alfredo Petrov collection |
Quick NavTopAbout ChibaiteUnique IdentifiersSimilar NamesIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesRelationshipsCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Arakawa, Minamiboso city, Chiba Prefecture, Japan