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The specimen is a composite cut from large crystals/crystalline masses, and is almost certainly from near Miass, Ilmen Mountains, Russia. The fine crystals from Virginia and Colorado, USA, the best known sources of amazonite in the 19th century, were not known in Corsi’s time. Amazonite is not known to come from the area of Brazil around the Amazon river.
Amazonite is a pegmatite mineral that derives its colour from trace lead, not copper. The scale-like appearance to which Corsi refers is a very characteristic feature of this stone and is where the mineral has crystallised into separate areas of white albite (sodium feldspar) within the green microcline (potassium feldspar).
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