Chrysocolla (Cu 2–x Al x {H 2–x Si 2 O 5 )(OH) 4 •nH 2 O(x<1)) is an opaque blue green crystal with high copper content. It is also made up of malachite, cuprite, azurite, limonite and quartz. It is often found in rounded mases in vein fillings or crusts.

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