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Molar mass: 101.960 g·mol −1 Appearance white solid Odor: odorless Density: 3.987 g/cm 3: ... remelted and densified to obtain α-Al2O3 clusters with much higher ...
Table of Refractive index; Wavelength(μm): n o: n e: 0.193: 1.92879: 1.91743 0.213: 1.88903: 1.87839 0.222: 1.8754: 1.86504 0.226: 1.87017: 1.85991 0.244: 1.85059: 1 ...
Al 2 O commonly exists as a gas, since the solid state is not stable at room temperature and is only stable between 1050 and 1600 °C. Aluminium(I) oxide is formed by heating Al and Al 2 O 3 in a vacuum while in the presence of SiO 2 and C, and only by condensing the products. [2]
Corundum is a crystalline form of aluminium oxide (Al 2 O 3) typically containing traces of iron, titanium, vanadium, and chromium. [3] [4] It is a rock-forming mineral.It is a naturally transparent material, but can have different colors depending on the presence of transition metal impurities in its crystalline structure. [7]
In the Earth's crust, aluminium is the most abundant metallic element (8.23% by mass [33]) and the third most abundant of all elements (after oxygen and silicon). [65] A large number of silicates in the Earth's crust contain aluminium. [66] In contrast, the Earth's mantle is only 2.38% aluminium by mass. [67]
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Aluminium hydroxide, Al() 3, is found in nature as the mineral gibbsite (also known as hydrargillite) and its three much rarer polymorphs: bayerite, doyleite, and nordstrandite.
Andalusite, kyanite, and sillimanite are the principal aluminium silicate minerals. [2] [3] [4] The triple point of the three polymorphs is located at a temperature of 500 °C (932 °F) and a pressure of 0.4 GPa (58,000 psi).