Sharp crystals with a fine gunmetal luster, to 1 cm corner to corner. Sometimes these have the crystals jammed against each other in a solid sheet, but these actually show some isolation with matrix showing through, making it really attractive. Many of these specimens show a lot of oxidation and damage, but this one is in great condition, with no areas of degraded crystals. 10.8 x 6.3 x 2.9 cm