<P> Moon rocks fall into two main categories: those found in the lunar highlands (terrae), and those in the maria . The terrae consist dominantly of mafic plutonic rocks . Regolith breccias with similar protoliths are also common . Mare basalts come in three distinct series in direct relation to their titanium content: high - Ti basalts, low - Ti basalts, and Very Low - Ti (VLT) basalts . </P> <P> Almost all lunar rocks are depleted in volatiles and are completely lacking in hydrated minerals common in Earth rocks . In some regards, lunar rocks are closely related to Earth's rocks in their isotopic composition of the element oxygen . The Apollo moon rocks were collected using a variety of tools, including hammers, rakes, scoops, tongs, and core tubes . Most were photographed prior to collection to record the condition in which they were found . They were placed inside sample bags and then a Special Environmental Sample Container for return to the Earth to protect them from contamination . In contrast to the Earth, large portions of the lunar crust appear to be composed of rocks with high concentrations of the mineral anorthite . The mare basalts have relatively high iron values . Furthermore, some of the mare basalts have very high levels of titanium (in the form of ilmenite). </P> <Table> <Tr> <Td> <Table> <Tr> <Th> Mission </Th> <Th> Sample mass returned </Th> <Th> Year </Th> </Tr> <Tr> <Td> Luna 16 </Td> <Td> 101 g (3.6 oz) </Td> <Td> 1970 </Td> </Tr> <Tr> <Td> Luna 20 </Td> <Td> 30 g (1.1 oz) </Td> <Td> 1972 </Td> </Tr> <Tr> <Td> Luna 24 </Td> <Td> 170 g (6.0 oz) </Td> <Td> 1976 </Td> </Tr> </Table> </Td> </Tr> </Table> <Tr> <Td> <Table> <Tr> <Th> Mission </Th> <Th> Sample mass returned </Th> <Th> Year </Th> </Tr> <Tr> <Td> Luna 16 </Td> <Td> 101 g (3.6 oz) </Td> <Td> 1970 </Td> </Tr> <Tr> <Td> Luna 20 </Td> <Td> 30 g (1.1 oz) </Td> <Td> 1972 </Td> </Tr> <Tr> <Td> Luna 24 </Td> <Td> 170 g (6.0 oz) </Td> <Td> 1976 </Td> </Tr> </Table> </Td> </Tr>

What type of rock is the moon made from