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: 2.18 Kt

- Size 8.70x5.5x4.50 mm

- Cut: table and steps with octagonal elongated shape

- Color: intense dark green

- Purity: pure

- Treatments: none

- Origin: Brazil