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- Geochemical composition: The Tissint meteorite is an olivine-phyric shergottite, which means it is a type of meteorite composed of igneous rock that is formed from magma. The chemical composition of the Tissint meteorite is similar to other shergottite meteorites that are known to have come from Mars, such as the Shergotty and Zagami meteorites.
- Oxygen isotopes: The oxygen isotope composition of the Tissint meteorite is also similar to that of other Martian meteorites. Oxygen isotopes are variations of the element oxygen that have different masses. The relative abundances of different oxygen isotopes in a material can provide information about its origin. The Tissint meteorite has an oxygen isotope composition that is consistent with it having formed on Mars.
- Minerals: The Tissint meteorite contains several minerals that are typical of Martian meteorites, such as pyroxene and olivine. These minerals are formed at high temperatures and pressures, and they are often found in igneous rocks on Mars.
- Age: The Tissint meteorite is estimated to be about 1.5 billion years old. This age is consistent with other shergottite meteorites that are known to have come from Mars.
- Size: The Tissint meteorite is about 2.5 kilograms in weight. This is within the range of sizes for other Martian meteorites.
- Origin: The evidence from geochemical composition, oxygen isotopes, minerals, age, and size suggests that the Tissint meteorite may have come from Mars. However, it is important to note that this hypothesis has not been definitively proven, and some scientists believe that the Tissint meteorite may have come from another source, such as the Moon.
In addition to the Moroccan meteorite, some scientists also believe that the Shergotty and Zagami meteorites, as well as the Martian regolith Allan Hills 84001, come from Mars.