What is "akdalaite"

n. (context mineral English) A mineral with chemical formula 4Al₂O₃·H₂O.

Akdalaite is a very rare mineral found in Kazakhstan and has the formula 5 Al O· HO. It was formerly believed to be 4 Al O· HO. It is therefore the same as tohdite an artificially produced phase. Studies on the crystal structure and spectra indicate that this is an aluminium oxide hydroxide.