Properties
| Category | Cyclosilicate |
|---|---|
| Formula | BaTiSi3O9 |
| Crystal system | Hexagonal |
| Color | Blue, colorless |
| Crystal habit | Tabular dipyramidal crystals, granular |
| Cleavage | poor |
| Fracture | Conchoidal |
| Mohs scale hardness | 6–6.5 |
| Luster | Vitreous |
| Streak | White |
| Diaphaneity | Transparent to translucent |
| Specific gravity | 3.65 |
From the Wikipedia article
Benitoite is a rare, blue, barium titanium cyclosilicate mineral, found in hydrothermally altered serpentinite. It forms in low-temperature, high-pressure environments typical of subduction zones at convergent plate boundaries. Benitoite fluoresces under short-wave ultraviolet light, appearing bright blue to bluish white in color. The more rarely seen clear to white benitoite crystals fluoresce red under long-wave UV light.
Source
Source record: crystal-compendium/benitoite/minerals.json. Fetched from English Wikipedia by the operator 2 October 2026.
https://en.wikipedia.org/wiki/Benitoite — revision id 1355091416. Text and properties from Wikipedia, licensed CC BY-SA 4.0.