Kyanite, whose name derives from the Greek word kuanos sometimes referred to as "kyanos", meaning deep blue, is a typically blue silicate mineral, commonly found in aluminium-rich metamorphic pegmatites and/or sedimentary rock. Kyanite inmetamorphic rocks generally indicates pressures higher than four kilobars. Although potentially stable at lower pressure and low temperature, the activity of water is usually high enough under such conditions that it is replaced by hydrous aluminosilicates such as muscovite, pyrophyllite, or kaolinite. Kyanite is also known as disthene, rhaeticite and cyanite.
Kyanite is a member of the aluminosilicate series, which also includes the polymorph andalusite and the polymorphsillimanite. Kyanite is strongly anisotropic, in that its hardness varies depending on its crystallographic direction. In kyanite, this anisotropism can be considered an identifying characteristic.
At temperatures above 1100 ¡ãC kyanite decomposes into mullite and vitreous silica via the following reaction: 3(Al2O3¡¤SiO2) ¡ú 3Al2O3¡¤2SiO2 + SiO2. This transformation results in an expansion.
Application:
Kyanite is used primarily in refractory and ceramic products, including porcelain plumbing fixtures and dishware. It is also used in electronics, electrical insulators and abrasives.
Kyanite has been used as a semiprecious gemstone, which may display cat's eye chatoyancy, though this use is limited by its anisotropism and perfect cleavage.
Kyanite is one of the index minerals that are used to estimate the temperature, depth, and pressure at which a rock undergoes metamorphism.
Specification:
LJ-58£º
No.
Al2O3
SiO2
FE2O3
T1O2
K20+NaO
igloss
refractoriness
moisture
mesh
LJ-58
¡Ý58
¡Ü39
¡Ü1.5
¡Ü0.08
¡Ü0.02
¡Ü1.5
¡Ý1790
¡Ü1
40,80,120,200,325,etc.
LJ-60
No.
Al2O3
SiO2
FE2O3
T1O2
K20+NaO
igloss
refractoriness
moisture
mesh
LJ-60
¡Ý60
¡Ü37
¡Ü1.5
¡Ü0.08
¡Ü0.1
¡Ü1.5
¡Ý1790
¡Ü1
40,80,120,200,325,etc.
LJ-55£º
No.
Al2O3
SiO2
FE2O3
T1O2
K20+NaO
igloss
refractoriness
moisture
mesh
LJ-55
¡Ý55
¡Ü42
¡Ü1.5
¡Ü0.08
¡Ü0.03
¡Ü1.5
¡Ý1790
¡Ü1
40,80,120,200,325,etc.
In addition to the standard range of kyanite product above GREAT WALL MINERAL can manufacture kyanite grades tailored to customers specific requirements.
For more detailed information please contact the kyanite factory GREAT WALL MINERAL.[kyanite manufacturer, manufacturer of kyanite, kyanite powder, kyanite powder factory] [Keywords: kyanite, calcined kyanite, fused kyanite, kyanite powder, kyanite blocks, kyanite factory/factories]
