I had no reason to think this would catch anyone’s eye:
I think feldspar is my Spirit Mineral.
— Charles G Hill (@dustbury) July 8, 2014
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.