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About ChibaiteHide

Flag of Chiba Prefecture, Japan
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
Specific Gravity:
1.933 (Calculated)
Crystal System:
Named for Chiba Prefecture, Japan, that includes the 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.

Classification of ChibaiteHide

Approval Year:

Physical Properties of ChibaiteHide

6½ - 7 on Mohs scale
None Observed
1.933 g/cm3 (Calculated)

Optical Data of ChibaiteHide

RI values:
n = 1.470(1)
Isotropic minerals have no birefringence
Surface Relief:

Chemical Properties of ChibaiteHide

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
IMA Formula:
SiO2 · n(CH4,C2H6,C3H8,C4H10) (nmax = 3/17)

Crystallography of ChibaiteHide

Crystal System:
Class (H-M):
m3 (2/m 3) - Diploidal
Space Group:
F2/d 3
Cell Parameters:
a = 19.3742(4) Å
Unit Cell V:
7,272.29 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

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)

Type Occurrence of ChibaiteHide

Synonyms of ChibaiteHide

Other Language Names for ChibaiteHide


Common AssociatesHide

Associated Minerals Based on Photo Data:
Melanophlogite1 photo of Chibaite associated with Melanophlogite on

Other InformationHide

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 ChibaiteHide

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). []

Internet Links for ChibaiteHide

Localities for ChibaiteHide

ⓘ - 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Japan (TL)
  • Honshu Island
    • Kanto region
      • Chiba prefecture
        • Minamiboso city
IMA website - approvals March 2009
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