Specimen: Prismatic hexagonal Beryl crystals Locality: Left to right:
 

• Composition Beryllium aluminum silicate, sometimes with some sodium, lithium, and cesium
• Color Bright to pale green, light to dark blue,.
• Streak Colorless
• Hardness 7½½ - 8
• Luster Vitreous
• Cleavage 3,1 - basal
• Fracture Uneven to conchoidal
• Transparency Transparent to opaque
• Uses-Aqua Marine is a very tough metal, and is used in alloys to strengthen the metal.