Weight: 183.6 grams

Size: 59.2*50.4*23.1MM

International name: Muonionalusta, commonly abbreviated as M-iron/Mandela meteorite iron

Classification: IVA fine-grained octahedral iron meteorite, asteroid iron core fragment

Discovery site: Lapland region of the Arctic Circle in northern Sweden, first discovered in 1906

Cosmic age: 4.565 billion years, one of the oldest meteorites in the solar system

Landing history: About 1 million years ago, it fell to Earth, undergoing four glacial erosions during the Ice Age, with a global scattered zone of about 25×15 km

Composition: 90% iron, 8.4% nickel, contains trace amounts of cobalt, phosphorus, iridium, gallium, non-radioactive, safe and harmless to wear close to the body