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| Mahadeva | |||||||||||||||||||||||||||||||||||||||
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| Basic information | Name: Mahadeva This is an OFFICIAL meteorite name. Abbreviation: There is no official abbreviation for this meteorite. Observed fall: Yes, confirmed fall Year fell: 2019 Country: India Mass:  15 kg | ||||||||||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 11284 approved meteorites (plus 22 unapproved names) classified as H5. [show all] Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7) | ||||||||||||||||||||||||||||||||||||||
| Comments: | Approved 31 May 2020 | ||||||||||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 109:
Mahadeva 26°28’56.28’’N, 86°35’53.17’’E Bihar, India Confirmed fall: 2019 Jul 22 Classification: Ordinary chondrite (H5) History: A single stone weighing ~15 kg fell at 14:30 IST, July 22, 2019, in a water-laden paddy field near Mahadeva village, ~6 km east of the Laukahi Police station, Madhubani district, Bihar state, India. Farmers witnessed a fireball-like object and heard a loud sound, with emanations of smoke from the site after the fall. The meteorite was recovered by the farmers from a 1.5 m deep impact pit. Physical characteristics: The fusion crust is relatively smooth, dull brown, with regmaglypts (simple to compound). Flow lines are absent. A few broken surfaces of the sample expose the interior, with abundant grains of metal/sulfide set in a grayish white silicate matrix. Petrography: EPMA and SEM were used to examine a polished thick section. Most chondrules are in the 250-600 μm size range, and are barred, porphyritic, and cryptocrystalline varieties. Modal abundances are 40% olivine, 35% low-Ca pyroxene, 7% feldspar (makelynite/ plagioclase glass), 4% high-Ca pyroxene, 8% metal, 4% troilite, 2% accessories like chromite and merrillite. The matrix is coarsely crystalline, and chondrule-matrix integration is common. Feldspars (<70 μm) are common in matrix, some occurring as an interstitial phase within chondrules. Geochemistry: The olivine composition of chondrule and matrix are almost indistinguishable (Fa17-21, mean Fa19.3, and Fa19-23, mean Fa20.4, respectively). The feldspar in matrix is fairly uniform in composition of Ab80.3±1.9An17.1±2.4Or2.6±0.8. Low-Ca pyroxene and high-Ca pyroxene composition ranges are Fs17.6-19.3Wo1.6-3.2 and Fs6.8Wo46.6, respectively. Bulk chemical composition SiO2 (33.9%), FeO (35.7%), Al2O3(2.35%), CaO (1.76%), MgO (22.4%), Na2O (0.97%) and K2O (0.10%). Classification: H5 Specimens: 100 g at PRL. Main Mass at Bihar Museum, Patna. | ||||||||||||||||||||||||||||||||||||||
| Data from: MB109 Table 0 Line 0: |
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| Institutions and collections |
PRL: Physical Research Laboratory, Navrangpura, Ahmedabad, 380 009, India; Website (institutional address; updated 6 Dec 2017) |
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| References: | Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Geography:
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Statistics: This is 1 of 11 approved meteorites from Bihar, India This is 1 of 144 approved meteorites from India (plus 10 unapproved names) (plus 2 impact craters) | ||||||||||||||||||||||||||||||||||||||
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