Is a Hydrated Copper Aluminium Arsenate Hydroxide ,with formula Cu2Al7(AsO4)4(OH)13 · 11.5H2O and hardness of 5-6. Is mixed with another rare arsenate in green: Schlossmacherite.
The blue ceruleite occur mostly form Chile and this piece comes from Mina El Guanaco,Est Catalina,Taltal,Atacama Desert,II Region,Chile.-stabilized-
Size: 7.5x7.5x5 mm.
Weight: 1.01 ct.