Approx 7cm each 
Great for gridding
Satin spar is part of the same family as selenite, but us often mislabled as Selenite, 
Satin Spar is usually cheaper than selenite.
•Satin Spar is Milky White/Opaque/Shiny and may have vertical lines running down the length of the stone, selenite is transparent.
•Satin Spar is fibrous, Selenite is nonfibrous.
•Selenite has cleavage.
It is a must have for any home, not only is it self cleansing, it also cleanses other Crystals and removes stagnant residue energy in your home.