Selenite is a variety of gypsum, a sedimentary evaporite, that cleaves into broad sheets. I was amused by the folio/foliation connection between book and rock. It is named for the Greek moon goddess, Selene.
Unique, not editioned
Book: Crystalline Selenite,
laser-cut 1/16th-inch acrylic sheets,
modified Coptic-binding with linen thread
3.5" x 5" x 2.5"
Fremont Laser & Design, whose laser cut the acrylic pages for me, has some additional photos.