Brookite
Brookite is a rare titanium dioxide mineral and one of the three natural forms of TiO₂, alongside rutile and anatase. It is known for its unique crystal shapes and dark colors, and is mainly valued by collectors rather than used in jewelry.
About
Brookite
Brookite is a naturally occurring mineral composed of titanium dioxide (TiO₂) and belongs to the oxide mineral group. It is one of the three polymorphs of TiO₂, the other two being rutile and anatase. Brookite crystallizes in the orthorhombic crystal system and is known for its distinctive tabular or blade-like crystal forms. The mineral typically appears in colors such as brown, black, reddish-brown, or dark gray. In rare cases, it may also show yellow or even nearly colorless tones. Brookite crystals are usually opaque to translucent and exhibit a sub-metallic to adamantine luster. Although it can show some brilliance due to its high refractive index, it is not commonly used as a faceted gemstone.
Physical & Chemical Properties
| Name | Brookite |
|---|---|
| Scientific Name | Brookite |
| Mineral Group | Oxide |
| Hardness (Mohs) | 5.5 – 6 |
| Color | Brown, black, reddish-brown |
| Origin | Switzerland, Austria, Pakistan, USA, Brazil |
| Chemical Formula | TiO₂ |
Quick Facts
| Crystal System | Orthorhombic |
|---|---|
| Specific Gravity | 4.0 – 4.2 |
| Birthstone | NA |
| Refractive Index | 2.58 – 2.70 |
| Optical Character | Biaxial |
| Dispersion | Moderate to high |
| Major Sources | Switzerland, Austria, Pakistan, USA, Brazil |
| Treatments | Brookite is generally untreated |
| Price Range | $20 – $100 |
| Care Instructions | Handle gently to avoid scratches Clean with soft cloth and mild water Avoid chemicals and rough handling |