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CHAINPUR
Stony
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CHONDRITE
ORDINARY
H-L-LL
LL
-
3.4
S1
-
INDIA
1907
Unequilibrated Ordinary Chondrite LL 3.4, Shock Stage S1
PETROGRAPHY:
A thin section shows numerous chondrules, varying in size and internal structure, in an opaque black matrix. Some of the chondrules are made up of numerous idiomorphic olivine crystals in a cloudy mesostasis. Others consist of an aggregate of pyroxene crystals with low birefringence, polysynthetic twinning and oblique extinction, evidently clinopyroxene with low calcium content. Some pyroxene tubes have typical aggregates radiating eccentrically from thin sheets. Some condoms are extremely refined. Some consist of olivine and pyroxene within a single core. The main minerals in the meteorite are olivine and pyroxene (clinopyroxene largely or totally low in calcium). The minor constituents are FeNi and troilite. Other minerals present, in small amounts, include plagioclase, chromite and apatite or merrillite (or both). Source: Keil et al. (1964).
GEOCHEMISTRY:
Olivine with composition varying from Fa0 to Fa40 (0 to 40 mol% of Fe2SiO4), with an average composition around Fa25. The pyroxene phase is monoclinic and orthorhombic pyroxene, if present, exists in small quantities. The low calcium content of pyroxene, shown by electron beam probe analysis, shows that the mineral is best described as clinoenstatite for clinohyperthene, depending on the iron content. Its composition also varies from grain to grain, and within individual grains, but not to the same extent as that of olivine. Possibly significant characteristics are the amounts of C (0.36%) and H20 + (1.00%), which suggests that the dark matrix is permeated by organic material similar to that of carbonaceous chondrites. Source: Keil et al. (1964). Cr2O3 = 0.06 ± 0.04 in coarse grain Fe-olivine outside the matrix. Source: Grossman & Brearley (2005).
CLASSIFICATION:
Unequilibrated Ordinary Chondrite LL 3.4, Shock Stage S1. For more information, the article by keil et al. (1964) is available at http://digitallibrary.amnh.org/bitstream/handle/2246/3345//v2/dspace/ingest/pdfSource/nov/N2173.pdf?sequence=1&isAllowed=y
CLASSIFIERS:
Not reported by the Meteorical Bulletin database. A large study on the meteorite was developed by Keil et al. (1964).
HISTORY:
This remarkable meteorite fell on May 9, 1907 at 1:30 pm, like a shower of rocks near the village of Chainpur, in the Ganges plain - India. Source: Keil et al. (1964).
All information that does not have a specific source was extracted from the Meteoritical Bulletin Database.
All images are copyrighted.
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