60017 (120) Impact Melt Breccia
We would like to thank the following for the use of this sample:
60017 is a microbreccia composed primarily of well-rounded clasts of anorthositic gabbro, mosaically recrystallized anorthosite and large crystals of olivine set in a cryptocrystalline groundmass. The clasts frequently have a fine-grained rim due to reaction of the clast with the groundmass. The rock contains two dominant lithologies ~70% variolitic melt (rotation 1) and ~30% (mostly) dark aphanitic clasts (rotation 2). The variolitic melt consists of plagioclase clasts with interstitial mafic minerals, minor ilmenite, metallic iron, rare troilite, rare spinel and cryptocrystalline material. Spherulitic texture is often found. The dark matrix clasts are aphanitic and inhomogeneous.
The sample weighed 2102 grams before analysis and has not been dated.
Further details of this and other Apollo samples are here: http://curator.jsc.nasa.gov/lunar/
Note the thin section is slightly thick.
Ma = Millions of years ago
Rock forming mineral:
- metallic iron,