Lunar basalt is one of the major rocks that make up the Moon, formed from rock springs that formed in the outer layers of the Moon at a depth of about 200 km and crystallized on the lunar surface through multiple eruptions. It is the youngest rock on the Moon, formed between 3.3 and 3.7 billion years ago, almost as old as the oldest known rocks on Earth. Lunar basalts are fine-grained, porous, and composed mainly of pyroxene, plagioclase, and ilmenite. The content of pyroxene is about 50-59%, more common pyroxene than variable pyroxene; plagioclase is about 20-29%, pegmatite or calcium feldspar; ilmenite content is about 10-18%. Secondary minerals are olivine, chromite - titanium spinel, meteoric sulfur iron, iron, rutile, rutile, apatite, white calcium phosphate, copper, mica, nickel pyrite and a number of minerals have not been identified.
