This specimen is a historic atacamite from the type locality for the species (named circa 1801!) and is a style found only way back when, compared to the less robustly crystallized style of crystallization found in recent mining projects at this same locale. The sharp crystals are to 3-4 mm and highly lustrous, with a translucent dark evergreen color when strongly lit. Some damage, on this piece, but also many great crystals and pockets are preserved as well, and it is colorful and showy overall.