moonstones, which could come from fallen meteorites on Earth
Here are some points you should bear in mind:
1. Apollo brought back 381kg of samples from the Moon. The total amount of lunar material ever found on Earth is less than 50kg.
2. The first identification of a lunar meteorite was made in 1982 from a rock found in 1979. No rocks found before the Apollo landings have been confirmed as being of lunar origin, and any rocks found since that have been confirmed as lunar have only been identified as such by comparison with the Apollo sample collection.
3. An attentive middle-school geography pupil could instantly tell the difference between a rock found on Earth and one brought back from the Moon. It is part of the English 'O' level geography syllabus to visually recognise the mechanical and chemical weathering on rocks that take place in the presence of water and oxygen.
Additionally, meteorites show clear evidence of their high-velocity journey through the Earth's atmosphere in the form of their fusion crust. Apollo samples do not exhibit either mechanical/chemical weathering in a wet/oxygen environment or a fusion crust, but they do show signs of prolonged exposure to an environment completely unlike Earth's - for example surface crystal damage from cosmic rays and 'zap pits' from high-velocity micro-meteoroid bombardment in a vacuum, neither of which could occur within Earth's atmosphere but which would be obliterated if those rocks had arrived on Earth as meteorites (and would be replaced by the type of weathering already mentioned).
There are many other indications which demonstrate that the Apollo sample collection could only have been obtained by trained hands from the surface of the Moon, and no qualified geologist has ever doubted their authenticity. Why not find out more about it?