Tourmaline

Description

The tourmaline is an aluminum and alkali borosilicate complex , with iron, magnesium and other cations. Its range of colors is the largest in the mineral world

General Physical properties: hardness from 7 to 7.5 - density from 3.02 to 3.20 g/cm3 - refractive indexes about 1.62 and 1.64 with birefraction rather high

- Weight: 0.57 Kt

- Size 6.70x3.50x2.45 mm

- Cut: rectangular elongated table and steps

- Color: light green

- Purity: pure

- Treatments: none

- Origin: Brazil