Benitoite

The mineral is named after San Benito County, where it was first found and described by George Louderback in 1907.

Because of its color, benitoite was initially thought to be a variety of sapphire. This mistake was discovered after a chemical analysis of benitoite conducted with the use of X-rays.

Basic properties

Composition	BaTiSi₃O₉
Class	Silicates (cyclosilicates)
Crystal system	Hexagonal
Mohs' hardness	6-6,5
Fracture	Conchoidal
Cleavage	Poor
Lustre	Glassy
Streak	White
Localities	USA, Japan, Australia, Belgium