Case file · Cosmic event
Hypatia stone
A small black pebble found in 1996 by the geologist Aly Barakat in the Libyan Desert Glass field is claimed to be the first known fragment of a comet nucleus.
1996 CE · 25.30, 25.50 · status: disputed
The sceptical view
Its chemistry fits no known meteorite. Studies argue that it's extraterrestrial and very old, but its origin is still debated.