Short answers, pulled from the story.
Astronauts James Irwin and David Scott retrieved sample number 15415 during their second lunar EVA in July of 1971. The rock sat near a gnomon used for scale in photographs taken that day.
Chemical analysis revealed the rock was composed mostly of anorthite which defines its classification as an anorthosite. This type of plagioclase feldspar indicates specific cooling conditions within the Moon's history.
Samarium-neodymium dating methods established crystallization ages near 4.46 billion years. Other techniques approximate the total age between four and five billion years old based on radioactive decay rates within pyroxene minerals.
Apollo 14 mission retrieved sample number 14321 which surpassed Genesis Rock in age claims. That specimen now holds the title of oldest moon rock recovered by humans.
The Lunar Sample Laboratory Facility in Houston, Texas stores sample 15415 today. Conditions maintain integrity for future scientific study and public display purposes.