Most meteorites are typically quick small, and have a black fusion crust
, which gives them a resemblance to charcoal," he said, according to (http://www.
Scientists said that the dark, glassy surface of the rock, known as a fusion crust
, and indentations on its surface were the classic markings of a meteorite and seemed to confirm its origins.
The team are only able to identify these elements as an alloy of osmium, iridium and platinum, but its presence is unusual as the fusion crust
is formed over too short a time period for these elements to easily accumulate.
One of the rocks would have been from the outside of the meteorite and has a black coating called fusion crust
which makes it more valuable," said Rob.
The stunning green of their fusion crust
, created by flash heating while diving into Earth's atmosphere, prompted Ralew to send samples to meteorite expert Anthony Irving (University of Washington).
University of Wisconsin geology professor John Valley says the fragment has a so-called fusion crust
I had no doubt about my rock's extraterrestrial origin: its dark black fusion crust
stood out prominently among the dead crops.
The result is a glassy fusion crust
that is about a millimetre thick.
You can tell which ones are meteorites by looking for the fusion crust
, a thin, glassy coating that formed when the meteorite superheated during its fall through Earth's atmosphere.
This fusion crust
is created during the meteorite's fiery flight.
The wrinkled glassy coating on one face of the rock was clearly a fusion crust
, a kind of glaze that forms when a meteorite is heated as it passes through the atmosphere.
By the time it lands, a meteor's previously molten exterior will have cooled completely to form a hard, thin, black coating called a fusion crust