Ferri winchite 2.55 ct. 8 Sided Cut 8.40 x 8.40 x 5.00 mm Sweden y99341

Description

Ferri winchite 2.55 ct. 8 Sided Cut 8.40 x 8.40 x 5.00 mm Sweden y99341

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.