Chibaite
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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
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.
Classification of Chibaite
Approved
Approval year:
2009
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
Physical Properties of Chibaite
Vitreous
Colour:
colorless
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)
Birefringence:
Isotropic minerals have no birefringence
Surface Relief:
Moderate
Chemical Properties of Chibaite
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
IMA Formula:
SiO2 · n(CH4,C2H6,C3H8,C4H10) (nmax = 3/17)
Elements listed:
Crystallography of Chibaite
Crystal System:
Isometric
Class (H-M):
m3 (2/m 3) - Diploidal
Space Group:
Fd3
Setting:
F2/d 3
Cell Parameters:
a = 19.3742(4) Å
Unit Cell V:
7,272.29 ų (Calculated from Unit Cell)
Z:
4
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) |
Type Occurrence of Chibaite
Synonyms of Chibaite
Other Language Names for Chibaite
Japanese:千葉石
Common Associates
Associated Minerals Based on Photo Data:
| 1 photo of Chibaite associated with Melanophlogite | 46SiO2 · 6(N2,CO2) · 2(CH4,N2) |
Related Minerals - Nickel-Strunz Grouping
| 4.DA. | Carbon Dioxide Ice | CO2 | |
| 4.DA. | Bosoite | SiO2 · nCxH2x+2 | Hex. 6/mmm (6/m 2/m 2/m) : P6/mmm |
| 4.DA.05 | Quartz | SiO2 | Trig. 3 2 : P31 2 1 |
| 4.DA.10 | Opal | SiO2 · nH2O | |
| 4.DA.10 | Tridymite | SiO2 | Tric. 1 |
| 4.DA.15 | Cristobalite | SiO2 | Tet. 4 2 2 : P41 21 2 |
| 4.DA.20 | Mogánite | SiO2 | Mon. |
| 4.DA.25 | Melanophlogite | 46SiO2 · 6(N2,CO2) · 2(CH4,N2) | Tet. |
| 4.DA.30 | Lechatelierite | SiO2 | Amor. |
| 4.DA.35 | Coesite | SiO2 | Mon. 2/m : B2/b |
| 4.DA.40 | Stishovite | SiO2 | Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm |
| 4.DA.45 | Keatite | SiO2 | |
| 4.DA.50 | Seifertite | SiO2 | Orth. mmm (2/m 2/m 2/m) : Pbcn |
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.
References for Chibaite
Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
IMA website - approvals March 2009
Momma, K., Nishikubo, K., Takada, M., Takahashi, N., Honma, C., Nagase, T., Kudoh, Y., Ikeda, T. (2008) A clathrate mineral from Arakawa, Chiba Prefecture, Japan.
Momma, K., Ikeda, T., Nishikubo, K., Takahashi, N., Honma, C., Takada, M., Furukawa, Y., Nagase, T., Kudoh, Y. (2011) New silica clathrate minerals that are isostructural with natural gas hydrates. Nature Communications: 2: 196 (7 pages).
Momma, K., Miyawaki, R., Kuribayashi, T., Nagase, T. (2013) Single crystal X-ray diffraction experiments of a silica clathrate mineral chibaite. Photon Factory Activity Report 2012 #30 (2013) B.
Likhacheva, A.Y., Goryainov, S.V., Seryotkin, Y.V., Litasov, K.D., Momma, K. (2016) Raman spectroscopy of chibaite, natural MTN silica clathrate, at high pressure up to 8 GPa. Microporous and Mesoporous Materials: 224: 100-106.
Momma, K. (2017) Chibaite, a new mineral discovered from Minamiboso, Chiba Prefecture, Japan. Japanese Magazine of Mineralogical and Petrological Sciences: 46: 47-49 (in Japanese). [https://www.jstage.jst.go.jp/article/gkk/46/1/46_161222/_article/-char/ja/]
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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Localities for Chibaite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for 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) | |
| IMA website - approvals March 2009; Daisuke Nishio-Hamane (2018) Compression behavior of chibaite and bosoite. in abstracts of the 22nd IMA Meeting Melbourne p 468 |
Arakawa, Minamiboso city, Chiba Prefecture, Japan