rocksandstones
Microscopic view of chondrules in meteorite NWA3118 carbonaceous chondrite
www.lpi.usra.edu/meteor/metbull.php?code=3124 6
Writeup from Meteoritical Bulletin 89:
Northwest Africa 3118
Northwest Africa
Found 2003
Carbonaceous chondrite (CV3)
Hundreds of fragments (total weight of 5895 g) were purchased in Erfoud, Morocco in December 2003 by Adam and Greg Hupé. Description and classification (Ted Bunch and James Wittke, NAU): olive gray to tan in color depending on the degree of weathering. In thin section, much of the matrix has a pronounced “ripple” texture: subparallel, curvilinear thin bands of olivine grains (Fa32-36), up to 10 µm in size, enclose pod-like masses of micron to submicron Fe-rich olivine (Fa42-58), pyroxenes, sulfides and minor weathering products. Chondrules are typically <2 mm in diameter, although a few chondrules may be as large as 8 mm in diameter. A small stone was found to contain a dark inclusion measuring approximately 9 cm by 2.5 cm by 1 cm. Many types of small CAI inclusions are present and rarely exceed a few mm in diameter. Low weathering grade: no metal observed in the matrix, although some chondrules contain fresh metal. Specimens: 20.3 g, NAU; main mass, Hupé.
Microscopic view of chondrules in meteorite NWA3118 carbonaceous chondrite
www.lpi.usra.edu/meteor/metbull.php?code=3124 6
Writeup from Meteoritical Bulletin 89:
Northwest Africa 3118
Northwest Africa
Found 2003
Carbonaceous chondrite (CV3)
Hundreds of fragments (total weight of 5895 g) were purchased in Erfoud, Morocco in December 2003 by Adam and Greg Hupé. Description and classification (Ted Bunch and James Wittke, NAU): olive gray to tan in color depending on the degree of weathering. In thin section, much of the matrix has a pronounced “ripple” texture: subparallel, curvilinear thin bands of olivine grains (Fa32-36), up to 10 µm in size, enclose pod-like masses of micron to submicron Fe-rich olivine (Fa42-58), pyroxenes, sulfides and minor weathering products. Chondrules are typically <2 mm in diameter, although a few chondrules may be as large as 8 mm in diameter. A small stone was found to contain a dark inclusion measuring approximately 9 cm by 2.5 cm by 1 cm. Many types of small CAI inclusions are present and rarely exceed a few mm in diameter. Low weathering grade: no metal observed in the matrix, although some chondrules contain fresh metal. Specimens: 20.3 g, NAU; main mass, Hupé.