MASSIVE Blue Aragonite Crystal Cluster | Mineral Collection Display PieceBlue aragonite from Afghanistan is a calcium carbonate mineral that forms in low temperature hydrothermal or sedimentary environments. The blue coloration, ranging from pale sky blue to turquoise, is typically due to trace amounts of copper or other elemental impurities. Afghan specimens often occur as botryoidal or stalactitic masses with a smooth, banded surface and a waxy to silky luster. This material is relatively uncommon and is appreciated for