Retrieved 19 January Moore,'Argon Naturally transported Moon rocks in the form of lunar meteorites are sold and traded among private collectors. The idea that the age of a mineral can be anticipated by its size or colour is incorrect. Retrieved 17 August For other uses, see Moonrock. The results for the Mt.
However, Dalrymple  found that even volcanic glass can give wrong ages and rationalized that it can be contaminated by argon from older rock material.
The damage is caused by high energy alpha particles that are emitted by radiometric decay of the Uranium in the rock. Therefore, it's not surprising that some of Austin's dates, such as the result for the amphiboles, etc. They are handled only indirectly, using special tools. Most of the rocks are stored in nitrogen to keep them free of moisture. We have known for half a century that excess argon may be trapped in lava flows especially underwater flows under high pressureso much research in geochronology is devoted to improving the models. Particles like tiny bullets pierce the rock and leave a spherical pattern, outward from the U atoms.