A Victorian metal detecting hobbyist’s years-long struggle to crack open an unusual rock ultimately revealed a rare extraterrestrial treasure. The 17-kilogram (37-pound) meteorite,dubbed “Maribyrnong” after the nearby town,was recently identified by scientists at the Melbourne Museum as a 4.6-billion-year-old chondrite, offering a new window into the formation of our solar system. The discovery-only the seventeenth meteorite found in the state of Victoria-highlights the potential for citizen science adn the valuable insights these space rocks provide.
A seemingly unremarkable rock discovered by a metal detector enthusiast in Australia in 2015 turned out to be a rare meteorite, scientists revealed. David Hole, while searching in the Maribyrnong Regional Park near Melbourne, unearthed the heavy, reddish rock embedded in yellow clay, initially believing it might contain a gold deposit – a common hope in the historically gold-rich region.
Hole spent years attempting to open the rock using a rock saw, angle grinder, and drill, even resorting to acid, all to no avail. “I couldn’t open it,” he said, convinced he was on the verge of a golden find. It wasn’t until later that he discovered his persistence was directed at something far more valuable than gold: a meteorite.
“It had a sculpted appearance, with indentations,” explained Dermot Henry, a geologist at Melbourne Museum, in a 2019 interview with the Sydney Morning Herald. “This happens when it goes through the atmosphere – it melts from the outside and the atmosphere sculpts it.” The meteorite’s unusual shape hinted at its extraterrestrial origin, but confirmation required expert analysis.
Despite his inability to crack it open, Hole brought the mysterious rock to the Melbourne Museum for identification. According to Henry, who has examined thousands of rocks over 37 years, only two turned out to be genuine meteorites. This was one of them.
“If you saw a rock like this on the ground and picked it up, it shouldn’t be this heavy,” noted Bill Birch, another geologist at Melbourne Museum, to the Sydney Morning Herald. The unusual weight was a key indicator of its cosmic origins.
Researchers published a scientific paper detailing the meteorite, estimated to be 4.6 billion years old, naming it “Maribyrnong” after the nearby town. Weighing in at 17 kilograms (approximately 37 pounds), a small slice was cut using a diamond saw, revealing a high iron content, classifying it as a common chondrite H5. The interior also displayed small, crystallized droplets of metallic minerals known as chondrules. This discovery provides valuable insights into the early solar system and the building blocks of planets.
“Meteorites represent the cheapest way to explore space,” Henry stated. “They bring us back in time, providing evidence of the age, formation, and chemical composition of our solar system – including Earth. Some offer a glimpse into the interior of our planet. Others contain ‘stardust’ older than our solar system, showing us how stars form and evolve to create the elements of the periodic table. And rare meteorites contain organic molecules like amino acids, the building blocks of life.”
While scientists have determined the meteorite’s composition and age, its precise origin and how long it remained on Earth remain a mystery. The study of meteorites is crucial for understanding the formation of our solar system and the potential for life beyond Earth.
The early solar system was once a swirling mass of dust and chondritic rocks. Gravity eventually pulled much of this material together to form planets, but remnants settled into a massive asteroid belt. Researchers believe the Maribyrnong meteorite likely originated from this belt.
“This particular meteorite probably came from the asteroid belt between Mars and Jupiter, and was nudged out by collisions between asteroids before eventually falling to Earth,” Henry explained to Channel 10 News. Carbon dating suggests the meteorite was on Earth between 100 and 1,000 years ago, with several recorded sightings between 1889 and 1951 potentially marking its arrival.
Researchers argue that the Maribyrnong meteorite is far rarer – and therefore more scientifically valuable – than gold. It is one of only 17 meteorites recorded in the state of Victoria, Australia, and the second-largest chondrite mass discovered there, after a 55-kilogram sample found in 2003. “This is only the seventeenth meteorite found in Victoria, whereas thousands of gold nuggets have been found,” Henry told Channel 10 News. “In terms of the chain of events, it’s an astronomical discovery.”
The Maribyrnong meteorite isn’t alone in taking years to be properly identified. One space rock took 80 years, two owners, and a period of uncertainty before its true nature was revealed, as covered by Science Alert in 2018.
Linking meteorites to their parent bodies in space is often difficult, but recent research published in 2024 has successfully traced the origins of over 90% of known meteorites. This progress suggests it might be time to check your backyard for unusually heavy, hard-to-break rocks – you might just be sitting on a metaphorical goldmine.
