Gillespite in sanbornite
Is a Barium,Iron silicate with formula BaFe++Si4O10 and hardness of 4 . Are small red crystal on white matrix of sanbornite : another rare Barium phyllosilicate with formula Ba(Si2O5) and hardness of 5. Sanbornite shows a weak fluorescence at short wave.Another rarity never been facet before.
It comes from Mina la Madrelena,Tes Pozos,Baja California Norte,Mexico.
Size: 7x9.1x5 mm.
Weight: 2.32 ct.