Anorthosite is an intrusive igneous rock composed mainly of silicates called feldspar. It is an Earth rock that can be considered an analogue (it can be considered a “stand in” or a very similar type of rock) for the anorthosite that has been discovered on the Moon. Differences in the amount of volatile materials in Earth anorthosite and Moon anorthosite allow us to differentiate which is which. You can compare the anorthosite sample to the anorthosite that is contained within the Apollo Lunar Disks.
All images on this page are credit to National Space Centre unless otherwise stated.
A video showing the anorthosite
(Credit: National Space Centre)
Last updated: 03 October 2018