Even if free water were not found, it was fully expected that there would be water of crystallization in the lunar minerals. Learning at firsthand about the stuff of which the Moon is made from the actual lunar material carried back by the Apollo astronauts has been one of the most exciting scientific undertakings of our day. More than 700 scientists, including several hundred from twenty other countries, have spent uncounted hours analyzing samples, conducting laboratory tests, and theorizing over the significance of what was being revealed for the first time. Annually at the Johnson Space Center they have assembled to share their findings and to try to explain them. No water was found.
Lunar material is very dry.
The hydrous minerals so common on Earth arc exceedingly rare in the lunar rocks and soil. Moreover, lunar material is depleted in most volatile elements. The rocks in the lunar maria arc similar to, though significantly different from, lavas on Earth. Highland samples show a considerable separation of lunar material into different minerals, showing a differentiation like that responsible for the wide variety of rocks and minerals on Earth. Moon material is neither exactly like the meteorites nor exactly like the Earth's crust, but all three could have had a common source with a different history.