Ferri Winchite 5.90 ct Trillion Cut 13.30 x 12.30 x 7.00 mm Sweden y99344

Description

Ferri Winchite 5.90 ct Trillion Cut 13.30 x 12.30 x 7.00 mm Sweden y99344

Ferri-winchite

is relate to one of the many amphibole-group mineral with formula

([ ],Na)(Na,Ca)2(Mg, Fe++)4Fe+++[Si8O22](OH)2 and hardness of 5-6.

Here is associate with jacobsite a dark brown manganese iron oxide mineral.

It comes from Langban,Filipstad,Värmland -Sweden.

Glowing in orange red on short wave due to calcite layers.