Benitoite
Benitoite is a rare and highly valuable blue gemstone known for its brilliant sparkle and strong dispersion. It is one of the rarest gemstones in the world and is mainly found in California, USA.
About
Benitoite
Benitoite is a rare barium titanium silicate mineral with the chemical formula BaTiSi₃O₉. It belongs to the cyclosilicate mineral group and crystallizes in the hexagonal crystal system. Discovered in 1907 in San Benito County, California, it is the official state gemstone of California and is highly prized among collectors and gem enthusiasts. Benitoite is best known for its vivid blue color, which can range from light sky blue to deep sapphire-like blue. The color is caused by trace elements within its crystal structure. One of its most remarkable features is its strong dispersion, which is even higher than that of diamond, giving it exceptional fire and brilliance when cut properly. Transparent stones with high clarity are especially valuable.
Physical & Chemical Properties
| Name | Benitoite |
|---|---|
| Scientific Name | Benitoite |
| Mineral Group | Cyclosilicate |
| Hardness (Mohs) | 6 – 6.5 |
| Color | Blue (rarely colorless or pink) |
| Origin | California, USA (only major source) |
| Chemical Formula | BaTiSi₃O₉ |
Quick Facts
| Crystal System | Hexagonal |
|---|---|
| Specific Gravity | 3.6 – 3.7 |
| Birthstone | NA |
| Refractive Index | 1.76 – 1.80 |
| Optical Character | Uniaxial (+) |
| Dispersion | Very high |
| Major Sources | California, USA (only major source) |
| Treatments | Benitoite is typically untreated |
| Price Range | $500 – $1000 |
| Care Instructions | Avoid strong impacts Clean with mild soap and water Keep away from harsh chemicals Store separately |