Minerals identify

Know how to recognize them

Rutile

Oxide mineral

Rutile is a mineral composed primarily of titanium dioxide (TiO2), and is the most common natural form of TiO2. Other rarer polymorphs of TiO2 are known, including anatase , and brookite.

Rutile has one of the highest refractive indices at visible wavelengths of any known crystal and also exhibits a particularly large birefringence and high dispersion. Owing to these properties, it is useful for the manufacture of certain optical elements, especially polarization wavelengths up to about 4.5 μm.

Natural rutile may contain up to 10% iron and significant amounts of niobium. Rutile derives its name from the Latin rutilus, red, in reference to the deep red color observed in some specimens when viewed by transmitted light. Rutile was first described in 1803 by Abraham Gottlob Werner.

Identification

Color of mineral

Brown
Red
Yellow
Blue
Violet
Green
Grey
Black

Mohs scale ( mineral hardness )

6.0

The streak

Red

Density ( specific gravity )

2.613
2.909

Luster ( interacts light )

Adamantine

Crystal ( diaphaneity )

Tetragonal