Magnesio-Ferri-Fluoro-Orneblende 3.86 ct Trillion Cut 10.20 x 10.20 mm y907

Description

Magnesio-Ferri-Fluoro-Orneblende 3.86 ct Trillion Cut 10.20 x 10.20 mm y907

Magnesio-ferri-fluoro-hornblende

is a Calcium subgroup of the magnesio-hornblende group with Ca2[Mg4(Al,Fe+++)]Si7AlO22(OH)2 formula and hardness of 5-6. Has been discovered in Portoscuso, near Carbonia,Sardinia island, Italy.Greenish grey acicular blocky crystal aggregates in Calcite Feldspar matrix.From Eklogit Quarry, Lieser Valley, Spittal a. d. Drau, Carinthia / Austria