Amethyst with goethite ct.17.71

Amethyst with goethite The goethite is an iron hydroxide and become magnetic after heated ( is a special feature that occur only in this iron oxide) Here we can see some nice tufts random oriented into the crystals with yellow-brownish color. From Brazil. Size: 18.9x14.1x10 mm. Weight: 17.71 ct. CODE# 2313