Cordierite or iolite

Description

Aluminum and magnesium silicate crystallizing in the rhombic system

General physical properties: Hardness 7 or 7.5 - Density from 2.57 to 2.61 g/cm3 - Refractive indexes about 1.532 and 1.540
Strongly dichroic, it is also called "dicroite", transparent varieties are commonly called WATER SAPPHIRE due to the blue-purple color

- Weight: 1.42 Kt

- Size 8.20x5.30x4.70 mm

- Cut: table and steps with elongated octagonal shape 

- Color: intense blue tending to purple

- Purity: slight inclusions hardly visible to the naked eye and which, however, do not alter the beauty of the stone

- Treatments: none

- Origin: Madagascar