Minerals identify

Know how to recognize them

Brookite

Oxide mineral

Brookite is the orthorhombic variant of titanium dioxide , TiO2, which occurs in many natural polymorphic forms (minerals with the same composition but different structure). The International Mineralogical Association (IMA) recognizes four forms; the others are akaogiite), anatase) and rutile ). Brookite is rare compared to anatase and rutile and, like these forms, it exhibits photocatalytic Brookite has a larger cell volume than either anatase or rutile, with 8 TiO2 groups per unit cell, compared with 4 for anatase and 2 for rutile. Ta and niobium

It was named in 1825 by French mineralogist Armand Lévy for Henry James Brooke (1771–1857), an English crystallographer, mineralogist and wool trader.

Arkansite , US, that is also found in the Murunskii Massif , in the Aldan Shield , Russia, where many other unusual minerals occur.

At temperatures above about 750 °C, brookite will revert to the rutile structure.

Identification

Color of mineral

Red
Brown
Yellow
Black

The streak

Grey
Yellow

Density ( specific gravity )

2.583
2.584
2.7

Luster ( interacts light )

Metallic
Submetallic

Crystal ( diaphaneity )

Orthorhombic