Howardite (North West Africa 11899 Meteorite) 2 : 無料・フリー素材/写真
Howardite (North West Africa 11899 Meteorite) 2 / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
|---|---|
| 説明 | (cut slice; field of view ~9.2 centimeters across)----------------------------------------------------The “HED meteorites” are howardites, eucrites, and diogenites. They are rock samples from the Asteroid Belt between Mars & Jupiter. Unlike many meteorite types, HED meteorites have been successfully linked to a known, named parent body. Most meteorites are simply referred to as coming from “some parent body” in the asteroid belt. Chemical evidence indicates that HED meteorites are likely derived from Vesta, the 2nd-largest body in the Asteroid Belt and the largest asteroid there (Ceres is the # 1 largest body, but it is a dwarf planet, not an asteroid, despite what some may assert). The most common Vestan rocks are eucrites - basaltic rocks from Vesta’s crust. Seen here is howardite, a Vestan regolith breccia with clasts of eucrite and diogenite.This specimen is from the NWA 11899 Meteorite. It was obtained in 2017 in Mali, northwestern Africa. The rock is a polymict regolith breccia, as are all howardites. Published information indicates that about 60% of the clasts are diogenite (= Vestan pyroxenite) and about 40% are eucrite. Small amounts of metallic iron-nickel and troilite are present. |
| 撮影日 | 2023-03-27 13:08:27 |
| 撮影者 | James St. John |
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