Not Made of Cheese (Definitely) nor Labradorite (Probably): Lunar Anorthosite

When last we left labradorite, we’d discussed the fact that large bits of the Moon are composed of anorthosite. Isn’t that labradorite, you ask? And the answer is no. Not quite. Labradorite is a mineral, and anorthosite is a rock often made of it, but the two are not precisely equivalent.

I’m thrilled to say that ye olde labradorite post inspired another post at Sandatlas on just this topic: Lunar anorthosite. This is brilliant! It clarifies a lot of confusion and explains a lot about the Moon in the process.

So go read that, and enjoy some lovely pictures of anorthosite fetched down from the moon by Apollo astronauts.

Thin section photograph of Apollo 16 Rake Sample(s) 60055,4 using cross nichols light*


Lunar Ferroan Anorthosite 60025


Apollo 17 Astronaut Harrison Schmitt Collects Lunar Rock Samples

*Mind you, that’s “crossed nicols” (.pdf), despite what the caption from NASA says. Thanks to Silver Fox for the correction!

Not Made of Cheese (Definitely) nor Labradorite (Probably): Lunar Anorthosite
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