Quick Facts රතුකැට, General ...
රතුකැට |
---|
![](//upload.wikimedia.org/wikipedia/commons/thumb/8/80/Ruby_-_Winza%2C_Tanzania.jpg/220px-Ruby_-_Winza%2C_Tanzania.jpg) Natural ruby crystals from Winza, Tanzania |
|
Category | Mineral variety |
---|
රසායනික සූත්රය | aluminium oxide with chromium, Al2O3:Cr |
---|
|
පාට / පැහැය | Red, may be brownish, purplish or pinkish |
---|
Crystal habit | Varies with locality. Terminated tabular hexagonal prisms. |
---|
Crystal system | Trigonal (Hexagonal Scalenohedral) Symbol (−3 2/m) Space Group: R-3c |
---|
Cleavage | No true cleavage |
---|
Fracture | Uneven or conchoidal |
---|
Mohs scale hardness | 9.0 |
---|
Luster | Vitreous |
---|
Streak | white |
---|
Diaphaneity | transparent |
---|
Specific gravity | 4.0 |
---|
Refractive index | nω=1.768 – 1.772 nε=1.760 – 1.763, Birefringence 0.008 |
---|
Pleochroism | Orangey red, purplish red |
---|
Ultraviolet fluorescence | red under longwave |
---|
Melting point | 2044 °C |
---|
Solubility | none |
---|
|
Sapphire | Any color except shades of red |
---|
Corundum | various colors |
---|
Emery | Granular |
---|
Close