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Value B 1: 1.03961212 B 2: 0.231792344 B 3: ... sapphire (for extraordinary wave) 1.5039759: ... A browser-based calculator giving refractive index from Sellmeier ...
The Young's modulus of corundum (sapphire) has been reported by many different sources with values varying between 300 and 500 GPa, but a commonly cited value used for calculations is 345 GPa. [32] The Young's modulus is temperature dependent, and has been reported in the [0001] direction as 435 GPa at 323 K and 386 GPa at 1,273 K. [ 32 ] The ...
The 182-carat Star of Bombay, mined in Sri Lanka and located in the National Museum of Natural History in Washington, D.C., is another example of a large blue star sapphire. The value of a star sapphire depends not only on the weight of the stone, but also the body color, visibility, and intensity of the asterism.
Sapphire: 1.762–1.778: Boron nitride: 2–2.14 [31] Cubic zirconia: 2.15–2.18 [32] Potassium niobate (KNbO 3) 2.28: Zinc oxide: 390: 2.4: Cinnabar (mercury sulfide) 3.02: Birefringent: n ω = 2.905 n ε = 3.256 [33] Silicon: 1200 - 8500: 3.42–3.48 [34] Gallium(III) phosphide: 3.5: Gallium(III) arsenide: 3.927: Germanium: 3000 - 16000: 4 ...
Estimated value: CHF 1,916,000 [1] The Queen Marie of Romania Sapphire is a 478.68 carat (95.736 g) Cornflower blue cushion cut Ceylon sapphire.
Sapphires are a precious gemstone, a variety of the mineral corundum, consisting of aluminum oxide (α-Al 2 O 3) with trace amounts of elements such as iron, titanium, chromium, copper, or magnesium. It is typically blue, but natural "fancy" sapphires also occur in yellow, purple, orange, and green colors; "parti sapphires" show two or more colors.
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In optics and lens design, the Abbe number, also known as the Vd-number or constringence of a transparent material, is an approximate measure of the material's dispersion (change of refractive index versus wavelength), with high values of Vd indicating low dispersion.
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