Mesosiderite-B4
TKW 888.6 kg. Observed fall: no. Found 1956, Bondoc Peninsula, Luzon Island, the Philippines.
One of only three meteorites in this class.
Zsolt writes:
Thin Section of a Bondoc pyroxen nodule meteorite.
The nodule is fine- to coarse-grained, dull green, and roughly lenticular. The boundary with the Bondoc matrix is sharp. The nodule is a monomict breccia containing low-Ca pyroxene, with medium- to fine-grained plagioclase, abundant <1-mm silicate-opaque assemblages, and sparse Ca phosphates. No olivine was encountered. The silicate-opaque inclusions consist of one or more of the following - kamacite, taenite, troilite, an unidentified Fe silicate, chromite-spinel, Ca phosphate, and a silica phase. Fe-Ni metal and Fe sulfide occurs as up to 1-mm masses and veins through and around silicate grains.
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