DATOLITE with QUARTZ, BORON PIT, DALNEGORSK, PRIMORSKIJ, KRAJ, RUSSIA (cabinet)

Datolite is a calcium boron hydroxide nesosilicate, represented by the chemical formula CaBSiO4(OH). It was first identified by Jens Esmark in 1806 and was named by him from the Greek words δατεῖσαι, meaning "to divide," and λίθος, meaning "stone," in reference to the mineral's granular structure.

Datolite crystallizes in the monoclinic system, forming prismatic crystals and nodular masses. Its luster is vitreous, and it can be found in various colors including brown, yellow, light green, or colorless. The mineral a Mohs hardness of 5.5 and a specific gravity ranging from 2.8 to 3.0.