Astrophyllite is a rare, hydrous potassium iron titanium silicate mineral known for its striking, star-shaped, or radiating bladed crystal aggregates. It typically displays a bronze, golden-yellow, or chocolate-brown color, often embedded in a white or dark matrix (feldspar). Named for the Greek words "star" and "leaf," it is favored by collectors for its brilliant, sub-metallic to pearly luster.
