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Dokachi meteorite, Munshiganj District, Dhaka Division, Bangladeshi
| Regional Level Types | |
|---|---|
| Dokachi meteorite | Meteorite Fall Location |
| Munshiganj District | District |
| Dhaka Division | Division |
| Bangladesh | Country |
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Latitude & Longitude (WGS84):
23° 30' 0'' North , 90° 19' 59'' East
Latitude & Longitude (decimal):
Meteorite Class:
Meteoritical Society Class:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Nārāyanganj | 223,622 (2016) | 21.4km |
| Dohār | 45,543 (2016) | 22.0km |
| Char Bhadrāsan | 34,423 (2016) | 23.8km |
| Dhaka | 10,356,500 (2016) | 24.6km |
| Azimpur | 96,641 (2016) | 26.1km |
Ordinary chondrite, veined (H5)
Fell, 22 October 1903, 19 hrs; 3.84 kg
After the appearance of a fireball accompanied by detonations, a shower of over 100 stones fell. 24 stones were recovered, the largest with a mass of 1.571 kg. Most recovered stones were complete and usually covered with a largely intact and blackish fusion crust. A few grayish chondrules (PO, BO, RP) and grains of Fe-Ni metal and troilite are set within a grey and white matrix. Olivine (Fa19) and low Ca-orthopyroxene are characteristic of the H-chondrite geochemical group. Mineralogically, dominant olivine and low-Ca pyroxene are accompanied by minor troilite and Fe-Ni metal (kamacite, taenite). Accessory chromite, copper, and other minor opaques are also reported. Shock indicators include a number of veins and twinned prismatic Ca-poor clinopyroxene.
A Pb,Th:He age of 2.99 Ga and a cosmic-ray exposure age of 5.9 Ma are reported. The CRE age is similar to those of many other H5 chondrites, suggesting that as pre-terrestrial meteoroids some of the H5 meteorites were involved in the same collisions before eventual impact with the earth.
The H (relatively high in total iron) chondrites are the second largest group of ordinary chondrite falls and represent over 35% of well-classified, witnessed falls. As of late May 2017, Dokachi was one of 174 meteorite falls classified exactly as an H5 chondrite.
Approximately half of the mass was retained by the Geological Survey of India (Calcutta). ~ 500 g masses were also obtained by the Natural History Museum in London and by the Oxford University Museum.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsMineral List
6 valid minerals.
Meteorite/Rock Types Recorded
Note: data is currently VERY limited. Please bear with us while we work towards adding this information!
Select Rock List Type
Alphabetical List Tree DiagramDetailed Mineral List:
| ⓘ Chromite Formula: Fe2+Cr3+2O4 References: |
| ⓘ 'Clinopyroxene Subgroup' Description: Minor amounts of twinned low-Ca clinopyroxene. |
| ⓘ Copper Formula: Cu |
| ⓘ 'Fayalite-Forsterite Series' Description: Olivine Composition (Fa19) characteristic of H-group chondrites (Fa~17-20 mol%). |
| ⓘ Iron Formula: Fe |
| ⓘ Iron var. Kamacite Formula: (Fe,Ni) |
| ⓘ Isocubanite Formula: CuFe2S3 |
| ⓘ 'Orthopyroxene Subgroup' References: |
| ⓘ 'Plessite' |
| ⓘ Taenite Formula: (Fe,Ni) |
| ⓘ Troilite Formula: FeS References: |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Copper | 1.AA.05 | Cu |
| ⓘ | Iron | 1.AE.05 | Fe |
| ⓘ | var. Kamacite | 1.AE.05 | (Fe,Ni) |
| ⓘ | Taenite | 1.AE.10 | (Fe,Ni) |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Isocubanite | 2.CB.55b | CuFe2S3 |
| ⓘ | Troilite | 2.CC.10 | FeS |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Chromite | 4.BB.05 | Fe2+Cr3+2O4 |
| Unclassified | |||
| ⓘ | 'Clinopyroxene Subgroup' | - | |
| ⓘ | 'Fayalite-Forsterite Series' | - | |
| ⓘ | 'Plessite' | - | |
| ⓘ | 'Orthopyroxene Subgroup' | - | |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Chromite | Fe2+Cr23+O4 |
| O | ⓘ Fayalite-Forsterite Series | |
| Mg | Magnesium | |
| Mg | ⓘ Fayalite-Forsterite Series | |
| Si | Silicon | |
| Si | ⓘ Fayalite-Forsterite Series | |
| S | Sulfur | |
| S | ⓘ Isocubanite | CuFe2S3 |
| S | ⓘ Troilite | FeS |
| Cr | Chromium | |
| Cr | ⓘ Chromite | Fe2+Cr23+O4 |
| Fe | Iron | |
| Fe | ⓘ Chromite | Fe2+Cr23+O4 |
| Fe | ⓘ Iron | Fe |
| Fe | ⓘ Isocubanite | CuFe2S3 |
| Fe | ⓘ Iron var. Kamacite | (Fe,Ni) |
| Fe | ⓘ Taenite | (Fe,Ni) |
| Fe | ⓘ Troilite | FeS |
| Fe | ⓘ Fayalite-Forsterite Series | |
| Ni | Nickel | |
| Ni | ⓘ Iron var. Kamacite | (Fe,Ni) |
| Ni | ⓘ Taenite | (Fe,Ni) |
| Cu | Copper | |
| Cu | ⓘ Copper | Cu |
| Cu | ⓘ Isocubanite | CuFe2S3 |
Other Regions, Features and Areas containing this locality
AsiaContinent
Indian Plate (India Plate)Tectonic Plate
- Bengal FanPassive Margin
- Tripura-Cachar Foldbelt - Bengal basinBasin
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References
www.encyclopedia-of-meteorites.com (n.d.) http://www.encyclopedia-of-meteorites.com/test/Dokachi_don_edwards.JPG
Prior, G. T. (1923) Catalogue of Meteorites - With Special Reference to those Represented in the Collection of the British Museum (Natural History) (1st ed.) The Trustees of the British Museum, London.
Mason, Brian (1963) Olivine composition in chondrites. Geochimica et Cosmochimica Acta, 27 (10) 1011-1023 doi:10.1016/0016-7037(63)90062-0
