Description
7.5 – 8 Refractive index: 1.57 – 1.59 Density: 2.67 – 2.75 Chemical composition: Be3Al2(SiO3)6 Crystal structure: hexagonal
7.5 – 8 Refractive index: 1.57 – 1.59 Density: 2.67 – 2.75 Chemical composition: Be3Al2(SiO3)6 Crystal structure: hexagonal
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