ulexite
A mineral composed of hydrous sodium calcium borate; also known as TV rock or television stone due to its fiber-optic light-transmitting property.
See also: ウレキサイト
Ulexite is a mineral that transmits light like optical fiber.
Katakana loanword for ulexite, more common in modern mineralogical contexts than the kanji form 曹灰硼石.
The kanji spelling 曹灰硼石 is a direct translation of the mineral's composition: 曹 (sodium), 灰 (calcium), 硼 (boron), 石 (stone). The reading そうかいほうせき follows the on'yomi of each character.