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Chibaite

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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.
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.


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Classification of ChibaiteHide

Approved
Approval Year:
2009

Physical Properties of ChibaiteHide

Vitreous
Colour:
colorless
Hardness:
6½ - 7 on Mohs scale
Cleavage:
None Observed
Density:
1.933 g/cm3 (Calculated)

Optical Data of ChibaiteHide

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

Chemical Properties of ChibaiteHide

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

Crystallography of ChibaiteHide

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 DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
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

Japanese:千葉石

Common AssociatesHide

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

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). [https://www.jstage.jst.go.jp/article/gkk/46/1/46_161222/_article/-char/ja/]

Internet Links for ChibaiteHide

Localities for ChibaiteHide

This 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.

Locality ListHide

- 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). 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
Mineral and/or Locality  
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