What is "gyrolite"

n. (context mineral English) A hexagonal-pyramidal mineral containing aluminum, calcium, hydrogen, oxygen, silicon, and sodium.

Gyrolite (NaCaSiAlO(OH)·14HO) is a silicate mineral that is usually associated with zeolites. It most commonly is found as spherical or radial formations in hydrothermally altered basalt and basaltic tuffs. These formations can be glassy, dull or fibrous in appearance.

Gyrolite is also known as Centrallasite, Glimmer Zeolite or Gurolite.