{"title":"NWA 15858 - LL4 Ordinary Chondrite","description":"\u003cp\u003eNWA 15858 is an LL4 Ordinary Chondrite from Erg Chech, Mauritania, found on 21 February 2021. It was recovered as a single piece by meteorite researchers in the Mauritanian Sahara and later purchased in April 2021. As an LL Chondrite, NWA 15858 has low total iron and low metallic iron compared with H and L Chondrites, while its type 4 classification indicates moderate thermal metamorphism on its parent asteroid. The Meteoritical Bulletin records NWA 15858 as an approved LL4 Ordinary Chondrite with a mass of 163 g.\u003c\/p\u003e\n\u003cp\u003eNWA 15858 is described as a single stone with remnant fusion crust covering approximately 70 percent of one side, while the remaining surface is desert varnished. Petrographic study identifies it as an Ordinary Chondrite containing accessory iron-nickel metal, troilite, and chromite. Its mineral chemistry includes olivine and low-calcium pyroxene compositions consistent with LL4 classification, while the reported shock stage S2 and weathering grade W3 record both parent-body and terrestrial history.\u003c\/p\u003e\n\u003cp\u003eStudying NWA 15858 provides insight into the LL Chondrite parent body, moderate thermal metamorphism, and the preservation of single-stone desert meteorites. Its low-metal classification, limited known mass, Mauritanian provenance, and partial fusion crust make it especially appealing for collectors of classified Ordinary Chondrites. Each specimen represents ancient asteroid material formed over 4.5 billion years ago, preserved as part of a recognised Northwest African meteorite find.\u003c\/p\u003e","products":[],"url":"https:\/\/outerspacer.com\/collections\/nwa-15858-ll4-ordinary-chondrite.oembed","provider":"OuterSpacer Meteorites","version":"1.0","type":"link"}