Dendritic agate holds miniature forests: manganese and iron oxides crystallized into fern-like dendrites suspended in translucent chalcedony. No two scenes are ever alike, which makes each stone a small one-off painting. India and Brazil are principal sources; hardness about 7.Every dendritic agate at GEMIC Institute is natural, certified by our laboratory and photographed precisely as sold. Unique pieces, worldwide tracked delivery, 30-day returns.