From Rock and Gem:
Needles blue agate is a gem silica chalcedony that comes from the Blue Danube Mine near Lake Havasu. Its blue coloring comes from the copper minerals, where the agate has filled in the cracks of its rhyolitic host stone.
This exceedingly rare parcel includes 11 pieces, with a total weight of 393g. The largest weigh 99, 84, 79 and 54g each. They are shown wet.
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