Collection
Classification: DIO (Diogenite-olivine)
Observed fall: No
Year found: 2023
City, Country: Northwest Africa
Mass: 1414 g
In collection
Weight #1 : 19,69 g
Certificate of authenticity: Yes (1)
NWA 16480 is classified as an olivine-bearing diogenite (DIO), a rare type of achondritic meteorite linked to the differentiated asteroid 4 Vesta. Diogenites typically consist predominantly of orthopyroxene, but the notable presence of olivine in NWA 16480 suggests it formed in transitional zones between Vesta’s deep interior and upper crust. Its coarse-grained texture indicates slow cooling, allowing large, well-formed crystals to develop. By studying NWA 16480, scientists gain valuable insights into the complex magmatic processes, thermal evolution, and layered structure of one of the earliest formed bodies in the solar system.
Under a light microscope, a thin section of NWA 16480 – an olivine-bearing diogenite (DIO) reveals a coarse-grained, crystalline assemblage dominated by large orthopyroxene crystals. These orthopyroxenes show straight extinction and characteristic first-order interference colors under polarized light. In addition, the presence of olivine grains can be identified by their higher relief, subtle color variation, and distinct optical properties when viewed under crossed polars. Minor accessories like chromite may appear as small, dark, opaque inclusions scattered throughout. The overall texture suggests slow cooling at depth within a differentiated parent body, allowing the growth of well-formed crystals and the incorporation of olivine into the diogenitic mineralogy.
