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Kaolinite

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Kaolinite Aluminum Silicate Hydroxide
Al2Si2O5(OH)4

Kaolinite shares the same chemistry as the minerals halloysite, dickite and nacrite.

The History Says

Kaolinite is also known as china clay and kaolin, named after Gaoling ("High Hill") in Jingde Town, Jiangxi, China. It was Discovered in the year 1867 in Kao-Ling, China.

The Present Scenario

Kaolinite is important to the production of ceramics and porcelain, and to produce glossy paper for magazines.

Kaolinite is a common phyllosilicate mineral. It is named for its type locality, Kao-Ling, Jianxi, China. It forms Kaolinite Group, members of which even belong to larger general group, Clays. Kaolinite's structure is composed of silicate sheets (Si2O5) bonded to gibbsite layers, aluminum oxide/hydroxide layers, Al2(OH)4.

Natural Kaolinite usually contains small amounts of uranium and thorium. Hence, it is useful in radiological dating. The crystallography of Kaolinite played an important role in Linus Pauling's work on the nature of the chemical bond.

Physical Properties of Kaolinite

Color Usually white, colorless, greenish or yellow.
Luster Earthy
Transparency Crystals are translucent.
Crystal system Triclinic; 1.
Crystal habits Foliated and earthy masses. Crystals of any size are rare and is usually microscopic.
Cleavage Perfect in one direction, basal.
Fracture Earthy
Hardness 1.5-2 (can leave marks on paper).
Specific gravity 2.6 (average).
Streak White
Other characteristics Clay like properties when water is added.

Associated Minerals of Kaolinite

Occurrences of Kaolinite

Kaolinite is spread around the world. Few of the localities are as follows:

Uses of Kaolinite

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