Naica Optical Selenite Crystal #1 measures approximately 2 13/16" x 1 13/16" x 1 3/16" (70mm x 47mm x 34mm) and weighs approximately 2.4 ounces (60.3 grams). This cluster is quite clear. You will always know Naica Selenite when you see it because of the striations on the crystals.
(Healing Crystal)
Hardness: 1.5 - 2.0
Origin: Naica, Chihuahua, Mexico