Iron Meteorite

Hardness: 4-5 Mohs (for iron-nickel metal); Color: Silvery-gray to dark gray/black, often with a brownish patina from terrestrial weathering; Luster: Metallic; Crystal Structure: Exhibits Widmanstätten patterns when etched (internal crystalline structure formed by slow cooling in space); Cleavage: None; Specific Gravity: 7.8-8.2

Formed in the cores of ancient asteroids in the early solar system, cooling very slowly over millions of years. They are then ejected from their parent bodies, travel through space, and eventually fall to Earth.

Primarily valued by collectors and scientists for research into the formation of the solar system. Smaller pieces are sometimes used in custom jewelry or ornamental objects. Historically, iron meteorites were an early source of iron for tools and weapons before iron smelting was developed.

Iron meteorites are one of the three main types of meteorites (the others being stony and stony-iron). They are typically composed of an iron-nickel alloy, with trace amounts of other elements like cobalt, phosphorus, and sulfur. The largest known meteorite, Hoba, is an iron meteorite found in Namibia. The Widmanstätten pattern is unique to iron meteorites and indicates their extraterrestrial origin.

In the field, iron meteorites are identified by their unusually high density (they feel much heavier than terrestrial rocks of the same size), strong magnetic attraction, and often a dark, melted-looking fusion crust (though this can erode). They may also have regmaglypts (thumbprint-like depressions) on their surface. A fresh break or cut surface will reveal shiny metallic material. A rust color or 'patina' is common due to terrestrial weathering. Common locations for discoveries include dry deserts (where they are preserved longer and are easier to spot against the light sand) and Antarctica. Collectors often use a strong magnet and check for density as initial identifiers.