The rock, which measures 2.9 centimeters (1.1 inches) across, is unique beyond the pyroxene. It is the oldest sample yet collected by Perseverance. It is from the Nochian epoch, an age in Mars’s ...

The composition of the magma, including the amount of silica and the presence of various gases, also influences the types of minerals and textures found in the resulting igneous rocks. Thundereggs ...

Investigate these igneous rocks by making observations. Describe these rocks - what colours, shapes and textures can you see? Are they all the same? What is different about them? One of these igneous ...