Ferrous anorthosite, you’re my hero

I had no reason to think this would catch anyone’s eye:

Marisa answered in TLO’s Monday Morning Tweets:

More specifically, lunar ferrous anorthosite.

If you’re not familiar with anorthosite, it’s a phaneritic, intrusive igneous rock characterized by a predominance of plagioclase feldspar (90 to 100 percent) and a minimal mafic component (0 to 10 percent). If you’re looking at the moon, the lighter-colored areas are largely composed of this very rock.

How much of this did I know before sitting down to write this? Around 15 to 25 percent, on a good day.

Maud Pie, alas, was not available for comment.


  1. fillyjonk »

    14 July 2014 · 7:55 pm

    Sounds more like Luna, frankly, than Maud.

    (Title, as many of them do, made me chuckle.)

  2. CGHill »

    14 July 2014 · 8:01 pm

    I figure Maud would know the rocks on an intellectual level; Luna would have known them on a more intimate level, what with the 1000-year experience and all, and might have resented them.

RSS feed for comments on this post