Turquise-blue Mixite, Laurium, Greece. Size: 6.8 x 5.0 x 3.6 cm.
Mixite is a rare copper bismuth arsenate mineral with formula: BiCu6(AsO4)3(OH)6·3(H2O). It crystallizes in the hexagonal crystal system typically occurring as radiating acicular prisms and massive encrustations. The color varies from white to various shades of green and blue. It has a Mohs hardness of 3.5 to 4 and a specific gravity of 3.8. It has an uneven fracture and a brilliant to adamantine luster.
It was discovered in 1879 near J´achymov, Czech Republic by mine engineer Anton Mixa.
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