Description: Hypersthene 12mm Square Beads 14pcs approxSize: 12mm X 12mmShape: SquareMaterial: HypersthenePackaging: Strand (approx 14 pcs) What is Hyperstene? The name hypersthene (HIGH-purse-theen) is of Greek origin: hyper (meaning "extreme" or "above") and sthenos ("strength"). This beautifully contrasting, splintery stone occurs in black, brown, gray and/or green. Hypersthene has a silky, pearly luster and wonderful pleochroism (play of color). It ranges from translucent to opaque, with medium hardness.