Minerals identify

Know how to recognize them

Kaolinite

Phyllosilicates,kaolinite-serpentine group

Kaolinite (/ˈkeɪəlɪnaɪt/ , part of the group of industrial minerals with the chemical composition Al )4. It is a layered silicate mineral sheet of silica (SiO 4) linked through oxygen to one octahedral (AlO 6) octahedra. Rocks that are rich in kaolinite are known as kaolin /ˈkeɪəlɪn/

The name "kaolin" is derived from "Gaoling" (Chinese : Gāolǐng; lit. 'High Ridge'), a Chinese village near Jingdezhen The name entered English in 1727 from the French version of the word: kaolin, following François Xavier d'Entrecolles 's reports on the making of Jingdezhen porcelain

Kaolinite has a low shrink–swell capacity and a low cation-exchange capacity (1–15 meq/100 g). It is a soft, earthy, usually white, mineral (dioctahedral phyllosilicate clay ), produced by the chemical weathering of aluminium silicate. In many parts of the world it is colored pink-orange-red by iron oxide , giving it a distinct rust hue. Lighter concentrations yield white, yellow, or light orange colors. Alternating layers are sometimes found, as at Providence Canyon State Park in Georgia, United States. Commercial grades of kaolin are supplied and transported as dry powder, semi-dry noodle, or liquid slurry.

Identification

Color of mineral

White
Red
Blue
Brown
Yellow

Mohs scale ( mineral hardness )

2

Density ( specific gravity )

1.553
1.559
1.569

Luster ( interacts light )

Dull
Pearly

Crystal ( diaphaneity )

Triclinic