Refractive index crystals

Pink rhombohedral crystals refractive index 1.855 density 4.13 g/cm decomposes on heating insoluble in water and ethanol soluble in acids. 

White monochnic crystals refractive index 1.56 density 7.1 g/cm sublimes at 970°C. 

Bluish-black orthorhombic crystals refractive index 3.34 density of solid 4.933 g/cm3 at 20°C density of the element in liquid form at 120°C 3.96 g/cm melts at 113.6°C to a black mobile liquid the solid can be sublimed to vapor below its melting point vapor pressure of solid at 25°C 0.3075 torr vapor pressure at 113.6°C 90.5 torr the liquid boils at 184.3°C giving violet vapors vapor density 6.75 g/L critical temperature 545.8°C critical pressure 48.9 atm critical volume 155 cm /mol dielectric constant of solid 10.3 at 23°C and... 

Reddish-hrown hexagonal crystal refractive index 2.91 density 5.25g/cm3 Moh s hardness 6.0 melts at 1565°C insoluhle in water dissolves in acids. 

White orthorhombic crystal hygroscopic density 3.65 g/cm soluble in water (26.6g/100g water at 20°C). The monohydrate is a yellowish-white monoclinic crystal density 3.0 g/cm decomposes at 300°C soluble in water. Heptahydrate is bluish-green monochnic crystal refractive index 1.47 hardness 2 Mohs density l.SOg/cm decomposes at about 60°C very soluble in water soluble in absolute methanol shghtly soluble in ethanol. 

Colorless orthorhombic crystals refractive index 1.804 Moh s hardness 3-3.5 density 6.60 g/cm decomposes on heating at 315°C practically insoluble in water (1.1 mg/L at 20°C) Ksp 1.46xlCLi3 at 25°C also insoluble in alcohol and ammonia soluble in acids and alkahes. 

Yellow monoclinic crystals refractive index 2.31 density 6.12 g/cm melts at 844°C decomposes on further heating insoluble in water also insoluble in ammonia and acetic acid soluble in acids and alkalies. 

White orthorhombic crystals refractive index 2.199 density 5.85 g/cm melts at 501°C vaporizes at 950°C partially soluble in cold water (6.73 g/L at... 

Colorless cubic or monoclinic crystals refractive index 1.782 density 4.53 g/cm3 at 20°C decomposes at 470°C soluble in cold water very soluble in boiling water 127 g/100 mL at 100°C also soluble in caustic soda, caustic potash and ammonia solution, and moderately soluble in alcohol. 

White monochnic or rhombic crystals refractive index 1.877 density 6.20 g/cm3 melts at 1,170°C very slightly soluble in water, 42.5 mg/L at 25°C Kspl.82xlCH sparingly soluble in hydrochloric and nitric acids slightly soluble in dilute sulfuric acid, more soluble in concentrated sulfuric acid insoluble in alcohol soluble in caustic soda and ammonium salts solutions. 

White cubic crystals refractive index 1.3915 density 2.635 g/cm melts at 845°C vaporizes at 1,676°C very shghtly soluble in water 0.27 g/lOOg at 18°C soluble in hydrofluoric acid insoluble in alcohol. 

White cubic crystals refractive index 1.955 density 4.076 g/cm melts at 449°C vaporizes around 1,180°C highly soluble in water (165 g/lOOg at 20°C), solubdity greatly increases in hot water (433g/100g at 80°C) also very soluble in methanol (343 g/lOOg at 20°C) and ammonia soluble in acetone (42.6g/100g at 18°C). 

The monohydrate constitutes colorless monoclinic crystals refractive index 1.465 density 2.06 g/cm loses water of crystallization at 130°C soluble in water, (more soluble than the anhydrous salt (34.9 and 29.2 g/lOOg at 25 and 100°C), respectively insoluble in acetone and pyridine. 

The anhydrous salt consists of white trigonal crystals refractive index 1.717 density 2.958 g/cm decomposes at 350°C practically insoluble in water (106 mg/L at room temperature) Ksp 1.0x10- low to moderate solubility under partial pressure of CO2 (3.5 and 5.9 g MgCOs/lOOg saturated solution at CO2 pressure 2 and 10 atm, respectively) insoluble in acetone and ammonia dissolves in acids. 

Anhydrous salt consists of white lustrous hexagonal crystals refractive index 1.675 density 2.32 g/cm melts at 714°C decomposes at a lower temperature of 300°C when heated slowly, releasing chlorine vaporizes at 1,412°C highly soluble in water, releasing heat (solubility 54.2 g/100 mL at 20°C and 72.7 g/lOOmL at 100°C) moderately soluble in ethanol (7.4 g/lOOmL at 30°C). 

Hexahydrate constitutes white rhombohedral crystals refractive index... 

The monohydrate MgS02 H20, as the mineral kieserite, consists of colorless monoclinic crystals refractive index 1.523 density 2.445 g/cm becomes anhydrous on heating at 200°C soluble in water. 

Epsom salt, or heptahydrate MgS02 7H2O, constitutes colorless monoclin-ic or rhombohedral crystals refractive index 1.433 density 1.68 g/cm loses six molecules of water of crystaUization at 150°C and converts to anhydrous form at 200°C highly soluble in water (71 g/lOOmL at 20°C) slightly soluble in alcohol and glycerol. 

Green cubic crystal refractive index 2.16 density 5.37 g/cm at 23°C Moh s hardness 5.5 melts at 1945°C insoluble in water. 

White tetragonal crystals refractive index 1.973 hardness 1.5 Mohs density 7.16 g/cm3 does not have a normal melting point triple point 525°C sublimes at 383°C insoluble in water, ethanol and ether. 

The heptahydrate, NiS04 7H2O, forms green rhomhohedral crystals refractive index 1.467 density 1.948 g/cm loses water on heating highly soluble in water (about 75 g/lOOmL at 15°C) soluble in alcohol. 

White granular powder or cubic crystals refractive index 2.071 darkens on exposure to hght density 5.56 g/cm Moh s hardness 2.5 melts at 455°C vaporizes at 1,547°C vapor pressure 1 and 5 torr at 912 and 1,019°C insoluble in water, alcohol and dilute acids soluble in ammonia solution and concentrated sulfuric acid, alkali cyanide, ammonium carbonate also soluble in potassium bromide and sodium thiosulfate solutions. 

The decahydrate consists of colorless monoclinic crystals refractive index 1.394 hardness 1.8 Mohs density 1.4 6g/cm3 decomposes at 32°C soluble in water insoluble in ethanol. 

White orthorhombic crystals refractive index 1.518 hygroscopic hardness 3.5 Mohs density 3.5 g/cm insoluble in water soluble in dilute acids with hb-eration of carbon dioxide. 

White crystalline powder orthorhombic crystals refractive index 1.622 hardness 3.3 Mohs density 3.96 g/cm melts at 1,605°C very slightly soluble in water 0.014 g/lOOmL at 30°C soluble in alkali chloride solutions shghtly soluble in alcohol insoluble in alkalis. 

White cubic crystals refractive index 2.200 (thorianite) density 10.0 g/cm3 hardness 6.5 Mohs melts at 3,390°C vaporizes at 4,400°C insoluble in water or alkalis soluble in acids with difficulties. 

White or yellowish-white powder odorless bitter taste hexagonal crystal refractive index 2.008 density 5.606 g/cm melts at 1,975°C practically insoluble in water, 1.6 mg/L at about 30°C soluble in dilute acids, ammonia solu-... 

White, heavy, amorphous powder or monoclinic crystals refractive index 2.13 density 5.68 g/cm Mohs hardness 6.5 transforms to tetragonal structure above 1,100°C and cubic form above 1,900°C melts at 2,710°C and vaporizes at about 4,300°C insoluble in water soluble in hydrofluoric acid and hot sulfuric, nitric and hydrochloric acids. 

Keywords Absorption ARROW waveguide Biosensor Chemical sensor Confinement Dielectrics Evanescent field Fiber optics Fluorescence Hollow core Liquid-core Loss Optical mode Photonic crystal Refractive index Resolution Scattering Sensitivity Total internal reflection Waveguide... 

S. T. Wu, A semiempirical model for liquid-crystal refractive index dispersions, J. Appl. Phys. 69, 2080 (1991). 

Crystal Refractive index n X. (mn) Temperature (K) Spectral dependence... 

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