Definitions

1. noun

A rare mineral, a hydrated calcium borate, Ca₁₀(BO₂)₆(OH)₄·4H₂O, found in borate deposits.

“The geologist analyzed the gyrolite sample under a microscope to determine its composition.”

2. adjective

Relating to or denoting gyrolite or its deposits.

“Gyrolite-rich areas in the desert were discovered by the team of explorers.”