10003 - Vesicular ilmenite basalt
We would like to thank the following for the use of this sample:
10003 is one of the earliest samples collected during the Apollo missions. It is a medium-grained vuggy, ilmenite basalt. It weighed 213 grams before analysis and is 3.9 billion years old. The rock has an ophitic texture (larger pyroxene crystals enclose earlier-formed plagioclase feldspar). Apart from ilmenite, pyroxene and plagioclase feldspar, the sample contains small amounts of olivine, cristobalite, troilite (an iron sulphide), rutile, metallic iron and a K-rich glass. The sample also contains a feldspar-rich xenolith (see rotation 2).
Chemical analyses of the olivine and pyroxene crystals show large compositional variations from enstatite to ferrosilite and augite to pigeonite respectively.
Further details of this and other Apollo samples are here: http://curator.jsc.nasa.gov/lunar/
Ma = Millions of years ago
Rock forming mineral: