Some minerals come from outer space. They're meteorites, which
are rock fragments. Every day, hundreds of millions of them
enter the earth's atmosphere. Most of them, however, are burned up
by the heat from air friction and never reach the ground. Meteors
large enough to reach the earth are called meteorites. Most minerals
found in meteorites are the same as those we have on earth. But,
there are some rare minerals known only in meteorites. Two of them
are cohenite and schreibersite.