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Okano meteorite, Sasayama, Taki, Hyogo, Japani
Regional Level Types
Okano meteoriteMeteorite Fall Location
Sasayama- not defined -
Taki- not defined -

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Latitude & Longitude (WGS84): 35° 5' North , 135° 12' East
Latitude & Longitude (decimal): 35.08333,135.20000
GeoHash:G#: xn0psd9xh
Locality type:Meteorite Fall Location
Meteorite Class:IIAB iron meteorite
Meteoritical Society Class:Iron, IIAB
Metbull:View entry in Meteoritical Bulletin Database
Köppen climate type:Cfa : Humid subtropical climate

Iron meteorite, hexahedrite (IIAB)
Fall, 7 April 1904; 4.742 kg

After the appearance of a morning fireball accompanied by a trail of white smoke and loud detonations, an iron-rich mass [18 x 12 x 7 cm] was recovered almost immediately from a 80 cm deep hole by a farmer who had seen it fall. One side of the mass was smooth, the other characterized by angular regmaglypts. A .2-1 mm thick fusion crust covers most of both sides. The Fe-Ni mass (5.4 wt% Ni) consists almost entirely of a single crystal of kamacite. The kamacite contains Neumann bands indicative of preterrestrial shock. Small troilite inclusions and even smaller schreibersite precipitates are found. Troilite nodules contain daubréelite lamellae and display deformation twinning further indicative of preterrestrial impacts.

Okano appears to be a very normal IIAB hexahedrite and is one of only 6 known IIAB falls. At the end of 2014 IIAB irons represented 11% of all recovered iron meteorites listed at the Meteoritical Society's Meteoritical Bulletin Database. The major part of the Okano mass (3.5 kg) is preserved at Kyoto University.

Regions containing this locality

Honshu Island, Japan

Island - 1,361 mineral species & varietal names listed

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Standard Detailed Strunz Dana Chemical Elements

Mineral List

4 valid minerals.

Meteorite/Rock Types Recorded

Note: this is a very new system on and data is currently VERY limited. Please bear with us while we work towards adding this information!

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Alphabetical List Tree Diagram

Detailed Mineral List:

Formula: Fe2+Cr3+2S4
Reference: Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages.;
'IIAB iron meteorite'
Reference: Meteoritical Society Database
Formula: Fe
Reference: Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages.;
Iron var: Kamacite
Formula: (Fe,Ni)
Reference: Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages.;
Formula: (Fe,Ni)3P
Description: As precipitates on the troilite. Rhabdites are common.
Reference: Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages.;
Formula: FeS
Description: Monocrystalline with numerous lenticular-acicular twins from plastic deformation.
Reference: Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages.;

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
var: Kamacite1.AE.05(Fe,Ni)
Group 2 - Sulphides and Sulfosalts
Unclassified Minerals, Rocks, etc.
'IIAB iron meteorite'-

List of minerals arranged by Dana 8th Edition classification

Metals, other than the Platinum Group
var: Kamacite,Ni)
Group 2 - SULFIDES
AmXp, with m:p = 1:1
AmBnXp, with (m+n):p = 3:4
Unclassified Minerals, Rocks, etc.
'IIAB iron meteorite'-

List of minerals for each chemical element

P Schreibersite(Fe,Ni)3P
S DaubréeliteFe2+Cr23+S4
S TroiliteFeS
Cr DaubréeliteFe2+Cr23+S4
Fe DaubréeliteFe2+Cr23+S4
Fe IronFe
Fe Iron (var: Kamacite)(Fe,Ni)
Fe Schreibersite(Fe,Ni)3P
Fe TroiliteFeS
Ni Iron (var: Kamacite)(Fe,Ni)
Ni Schreibersite(Fe,Ni)3P

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

Paleogene - Cretaceous
23.03 - 145 Ma

ID: 3185777
Mesozoic-Cenozoic volcanic and intrusive rocks

Age: Phanerozoic (23.03 - 145 Ma)

Lithology: Intermediate-felsic volcanic rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License


Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages.
Grady, M. M. (2000) Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge, New York, Oakleigh, Madrid, Cape Town. 690 pages.

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