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BISHUNPUR
Stony
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DESCRIPTION:
CHONDRITE
ORDINARY
H-L-LL
LL
-
3.15
S4
W0
INDIA
1895
Unequilibrated Ordinary Chondrite LL 3.15, Shock Stage S4, Weathering Stage W0.
PETROGRAPHY:
The meteorite is composed of chondrules and fragments of neatly outlined condoms (approximately 60% by volume) within a fine-grained, densely compacted matrix. Undulating extinction and mosaicism in olivine suggest a strong pre-estrial shock (level S4). Opaques (FeNi metal, troilite, chromite) and smaller silicates (low-Ca clinopyroxene, diopside) are present. The presence of feldspar and smectite indicates pre-terrestrial aqueous alteration. Source: www.mindat.org.
GEOCHEMISTRY:
The Bishunpur matrix has an unusual composition not only for S, but also for other elements, being exceptionally rich in Na, Mg, Al, Si, Cl, K and Cr and is low in FeO. Electron microscope analysis of the finely granulated matrix: Na2O 3.31; MgO 14.2; Al2O3 4.93; SiO2 44.9; P2O5 0.03; Cl 0.33; K2O 0.70; CaO 1.31; TiO2 0.09; Cr2O3 0.66; MnO 0.27; FeO 22.9; Ni 0.87; FeS 2.04. Total = 95.0 (% by weight). Fa = 15.4 ± 8.1 and Cr2O3 = 0.22 ± 0.16 in coarse-grained Fe-olivine outside the matrix. Source: Grossman & Brearley (2005).
CLASSIFICATION:
Unequilibrated Ordinary Chondrite LL 3.15, Shock Stage S4, Weathering Stage W0.
CLASSIFIERS:
Not reported by the Meteorical Bulletin database. Reclassified by Grossman & Brearley (2005).
HISTORY:
The Indian meteorite Bishunpur, widely studied worldwide, was seen to fall on April 26, 1895. After hearing the “detonations”, four fragments were recovered by local residents, two of which were recovered in the city of Bishunpur (942 g) and the two others in Parjabatpur (97 g), 1.8 km away. Source: www.mindat.org.
All information that does not have a specific source was extracted from the Meteoritical Bulletin Database.
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