26
Jan
EMERALD
MINERAL: Beryl
CHEMISTRY: Be3Al2Si6O18
COLOR: Vibrant green
REFRACTIVE INDEX: 1.577 to 1.583
BIREFRINGENCE: 0.005 to 0.009
SPECI...
26
Jan
AQUAMARINE
MINERAL: beryl
CHEMISTRY: Be3Al2Si6O18
COLOR: greenish blue, light in tone
REFRACTIVE INDEX: 1.577 to 1.583
BIREFRINGENCE: 0.005 ...
26
Jan
MORGANITE
MINERAL: Beryl
CHEMISTRY: Be3Al2Si6O18
COLOR: Pink to orange-pink
REFRACTIVE INDEX: 1.583 to 1.590
BIREFRINGENCE: 0.007 to 0.00...
26
Jan
TOURMALINE
MINERAL:Tourmaline
CHEMISTRY: Elbaite Na(Li1.5,Al1.5)Al6Si6O18(BO3)3(OH)4 Dravite NaMg3Al6Si6O18(BO3)3(OH)4 Liddicoatite Ca(Li2Al)A...
26
Jan
TOPAZ
MINERAL:Topaz
CHEMISTRY: Al2(F,OH)2SiO4
COLOR: Yellow, orange, brown, pink to red to purple red, blue, light green and colorless
R...
26
Jan
SPINEL
MINERAL: spinel
CHEMISTRY: MgAl2O4
COLOR: red, orange, pink, purple, blue, black
REFRACTIVE INDEX: 1.718
BIREFRINGENCE: None
SPE...
28
Jan
TANZANITE
MINERAL: ZOISITE
CHEMISTRY: Ca2Al3(SiO4)3(OH)
COLOR: Violet blue to bluish violet to violet purple
REFRACTIVE INDEX: 1.691 to 1.70...
28
Jan
PERIDOT
MINERAL: Olivine
CHEMISTRY: (MgFe)2SiO4
COLOR: Yellowish green
REFRACTIVE INDEX: 1.65 to 1.69
BIREFRINGENCE: 0.035 to 0.038
SPEC...
28
Jan
OPAL
MINERAL: Hydrated Silica
CHEMICAL COMPOSITION: SiO2•nH2O
COLOR: All colors
REFRACTIVE INDEX: 1.37 to 1.47
BIREFRINGENCE: None
S...
