Description: Hypersthene 10mm x 14mm Oval Beads 13pcs approxSize: 10mm X 14mmShape: OvalMaterial: HypersthenePackaging: Strand (approx 13 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.