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Cyanite has got the chemical formula Al2[O|SiO4] and so it is an aluminium silicate. This mineral has got the name cyanite, because it is often blue. Another name for cyanite is disthene. The reason for this name is that cyanite has got a different hardness in different directions. In the longitudinal direction the hardness is 4 and across it is 7. The difference is very big. Usually cyanite is found in form of long and relative thin crystals which are blue. Mostly cyanite is transparent. Jewels are also made of cyanite, but not very often. Cyanit can found in Brazil, in India, in Australia, in Austria, in Switzerland and in the USA.

Data about Cyanite
Chemical formula Al2[O|SiO4]
Mineral class silicates
Crystal system triclinical
Hardness 4 (at full length) 7 (across)
Density 3.6 g/cm3 to 3.7 g/cm3
Color colorless, white, green, blue
Line color white
Gloss glass gloss
Break inflexibly
Fissileness perfectly

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Last Update: 21.01.2006