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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
6½ - 7
For 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.

Classification of Chibaite

Approval Year:

Type Occurrence of Chibaite

Physical Properties of Chibaite

Hardness (Mohs):
6½ - 7
None Observed
1.933 g/cm3 (Calculated)

Crystallography of Chibaite

Crystal System:
Class (H-M):
m3 (2/m 3) - Diploidal
Space Group:
Space Group Setting:
F2/d 3
Cell Parameters:
a = 19.3742(4) Å
Unit Cell Volume:
V 7,272.29 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction Data:
11.210 (24)
6.858 (38)
5.847 (83)
4.847 (24)
3.956 (25)
3.730 (91)
3.426 (40)
3.276 (100)

Optical Data of Chibaite

RI values:
n = 1.470(1)
Max Birefringence:
δ = 0.000 - Isotropic minerals have no birefringence
Surface Relief:

Chemical Properties of Chibaite

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
All elements listed in formula:

Other Names for Chibaite

Name in Other Languages:

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:
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.

Internet Links for Chibaite URL:
Please feel free to link to this page.

Localities for Chibaite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Japan (TL)
  • Honshu Island
    • Kanto region
      • Chiba prefecture
        • Minamiboso city
IMA website - approvals March 2009
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