Most, about 86%, of the Martian meteorites are basalts (all of those meteorites known as shergottites). All basalts, regardless of where they were formed, are similar because the process that formed them (melting in the interior of a planet) is the same.

"Basalt is a common gray to black volcanic rock. It is usually fine-grained due to rapid cooling of lava on the Earth's surface. It may be porphyritic containing larger crystals in a fine matrix, or vesicular, or frothy scoria. Unweathered basalt is black or gray.

All are a rock type common in Earth's crust: basalt, a mixture of the minerals pyroxene, feldspar and olivine. Basalts are present in the rocky crusts of differentiated planets and asteroids throughout the solar system. For example, Zagami (top) was blasted from the crust of the planet Mars by an impact about three million years ago.

Meteorites are fragments of rock or metal that fall to Earth from space. They are very rare, but many people find unusual rocks or pieces of metal and wonder if they might have found a meteorite. The USGS doesn't verify meteorites, but they have several properties that help distinguish them from other rocks:

Meteorite or Meteorwrong? ...the Path to Identification Have you ever wondered if your “interesting rock” is a meteorite? Here are some clues to help distinguish real meteorites from terrestrial rocks and manmade materials. Official classification of meteorite type and name requires analysis by a meteorite laboratory.

Physical characteristics: Grayish rock without fusion crust. Petrography: The meteorite displays a light grayish interior and is a polymict breccia predominantly composed of up to 7 mm sized basaltic and gabbroic clasts as well as mineral fragments set …

Most such rocks among the meteorites are basalts. Most common are the eucrites and diogenites which come from a large asteroid like 4 Vesta that had volcanoes, martian meteorites (Mars has some really big volcanoes), and about 5% of the lunar meteorites .

2020年2月1日 · Here we show that mare basalts, including Apollo samples and meteorites, have remarkably consistent δ 66 Zn values (+ 1.4 ± 0.2 ‰) and Zn abundances (1.5 ± 0.4 ppm). Analyses of magnesian-suite rocks show them to be characterized by even heavier δ 66 Zn values (2.5 to 9.3‰) and low Zn concentrations.

The most common type of volcanic rock on solar-system bodies is basalt, a dark, fine-grained igneous rock composed mainly of the minerals plagioclase and calcium pyroxene. Basalts occur on Earth, the Moon, Mars and differentiated asteroids. Eucrites are basaltic meteorites that come from a differentiated asteroid, perhaps Vesta.

Dho 287A is only the fourth crystalline mare basalt meteorite found on Earth to date and is the subject of the present study. The basalt consists mainly of phenocrysts of olivine and pyroxene set in a finer-grained matrix, which is composed of elongated pyroxene and plagioclase crystals radiating from a common nucleii.