Mooie Chroom Groene Tourmalijn 5x3 mm Cabochon van 0.25 CT. Color: Top Chrome Green Clarity: Very Slight Inclusion To Inclusion Luster: Good Origin: Africa Hardness: 7 - 7.5 Specific Gravity: 3.0+ Refractive Index: 1.62 - 1.68 Chemical Composition: Na(Li,Al)3Al6Si6O18(BO3)3 (OH)4, Sodium Lithium Aluminum Boro-Silicate Hydroxide Crystal Structure: Trigonal Treatment: None
