Ancient Martian meteorite Teghaza 001 is from unsampled crust

A Science paper provides an initial characterization of Teghaza 001, a meteorite named for a salt plain in Mali. A Science Advances paper details the rock's water content. The meteorite is identified as a piece of Mars.

Teghaza 001 is a piece of Mars and one of the oldest Martian meteorites ever found. Its age is more than 4.1 billion years, and it is among the three most ancient Martian meteorites on Earth.

The initial characterization appears in Science, and a Science Advances paper details the meteorite's water content. Yang Liu is the lead author and is affiliated with NASA's Jet Propulsion Laboratory. Lee Saper is affiliated with JPL and NASA's Ames Research Center.

The meteorite is named after a salt plain in Mali and weighs nearly 2 pounds (800 grams). It is one of roughly 435 Martian meteorites.

Martian meteorites are blasted off Mars by impacts and later found on Earth, often by collectors in deserts or snowy plains. Their Martian origin is checked by comparing mineral and chemical components with NASA Mars mission data.

The University of New Mexico identified Teghaza 001 as Martian based on oxygen isotopes. A slice of the meteorite was used to determine the age of the rock.

The rock has igneous minerals, a unique texture, and an ancient age. Its crust formed from cooling magma before being altered by subsurface water.

Teghaza 001's mineralogy matches Mars Reconnaissance Orbiter observations in the southern highlands. Several potential locations match the meteorite's mineralogy and chemistry, and the rock is described as the first Martian crust sample from a previously unsampled part of Mars.

ALH84001 is similar in age to Teghaza 001 and is composed almost entirely of one mineral. Black Beauty formed about 2.1 billion years ago and contains small volcanic rock fragments.

Teghaza 001 is described as the first Martian crust sample from a previously unsampled region of Mars, and its minerals match Mars Reconnaissance Orbiter observations. That gives a concrete example of how a physical sample can ground-truth remote-sensing data.

For readers tracking the lunar industry, the relevant point is that NASA Mars mission data and mineral-chemical matching can verify the origin of planetary material, while orbital observations can be compared with a physical sample.