Brenham

A Kansas farmer's wife collected heavy black rocks for years – and proved scientists wrong about where they came from.

Key facts

Type

Stony-iron, pallasite (main group, anomalous)

Fell or found

Found

Year

1882 (first finds)

Country

United States (Kansas)

Mass

several tonnes recovered

Official name

Brenham

In the 1880s, settlers farming near the small community of Brenham, in Kiowa County, Kansas, kept turning up heavy, dark rocks in their fields. Most people treated them as a nuisance, but Eliza Kimberly, who farmed there with her husband, became convinced that they had fallen from the sky. She collected them, even though her neighbours thought the idea was ridiculous. Their doubt was understandable: heavy dark stones are not unusual, and most rocks that people suspect are meteorites turn out to be Earth rocks or industrial slag. In 1890 she persuaded a professor, Francis Cragin of Washburn College, to come and look. He confirmed that they were meteorites and bought several of them.

Brenham has since become one of the most famous meteorites in the United States.

Stone and metal together

Brenham is a pallasite, a rare and beautiful type of stony-iron meteorite. Pallasites are made of crystals of the mineral olivine, often yellow-green, embedded in iron-nickel metal. Some Brenham specimens have plenty of olivine, while others are almost entirely metal, so pieces vary greatly in appearance. When polished slices are held up to the light, the olivine crystals can glow like coloured glass.

Pallasites have traditionally been thought to form where the metal core of a melted asteroid met its rocky mantle, mixing olivine with liquid metal. Other explanations, involving collisions that drove metal into olivine-rich rock, are also being explored. Brenham is related to the main group of pallasites, which share very similar chemistry, although its own chemistry is slightly unusual, so it is classed as an anomalous member.

The Haviland crater

In the 20th century, the meteorite hunter Harvey Nininger studied a shallow depression on a farm near Haviland, close to Brenham. In the 1930s his excavations showed that it was a small impact crater, roughly 15 metres across, surrounded by meteorite fragments. It is one of the smallest impact craters known and a rare example of a crater made by a pallasite. Today it is known as the Haviland crater.

A modern discovery

Brenham's story did not end in the 19th century. In 2005, a team of meteorite hunters using a large metal detector found a pallasite mass weighing around 650 kilograms buried in a field in the area. It was an oriented meteorite, meaning that it had kept a stable position as it fell through the atmosphere, so its front surface was shaped into a rounded cone by melting and ablation. It is thought to be one of the largest oriented pallasites ever found.

Over more than a century, several tonnes of Brenham meteorites have been recovered, from small fragments to masses weighing hundreds of kilograms. Many specimens are held by museums around the world.

Brenham also shows how meteorite hunting changed during the 20th century. Nininger, who bought and studied thousands of meteorites, encouraged farmers across the Great Plains to look out for unusual heavy stones, and in later decades increasingly powerful metal detectors made it possible to find masses buried well below the surface.

Why it matters

Brenham shows the importance of curiosity and persistence. Eliza Kimberly's belief that her rocks had come from space was not taken seriously at first, but her careful collecting led to one of the best-known meteorite finds in North America. Her story is a reminder that people without formal scientific training can make real discoveries, especially when they share their finds with experts.

Scientifically, Brenham is a valuable source of pallasite material for studying how metal and olivine came together inside an early asteroid, and the Haviland crater helps scientists understand how small, strong meteorites behave when they strike the ground.

The Brenham fields are privately owned, and permission is needed to search there. As with any meteorite hunting, respect landowners, follow local laws, and record carefully where any find was made.

Did you know?

See more

Brenham in the catalogue