Grote en Mooie Prehniet Cabochon uit Brazilië 15.5x22.5x1.2 mm 32.54 CT. Ovaal Color: Green Clarity: Transparent Luster: Lovely Origin: Brazil Hardness: 6 - 6.5 Specific Gravity: 2.9 - 2.95 Refractive Index: N/A Chemical Composition: Ca2 Al2 SI3 O10(Oh)2, Calcium Aluminum SIlicate Hydroxide Crystal Structure: Orthorhombic Treatment: None