Azurite Orbs in Granite
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This unusual rock is ordinary granite but has scattered subspherical masses of bluish-colored azurite (Cu3(CO3)2(OH)2 - copper hydroxy-carbonate). Minor greenish-colored malachite is also present (Cu2CO3(OH)2). The granite is composed of quartz (SiO2), microcline feldspar (KAlSi3O8), albite feldspar (NaAlSi3O8), and mica.
Source: https://www.lustroitaliano.com/gallery-granite-stone-s/1912.htm
