It is commonly called alumina, and may also be called aloxide, aloxite, or alundum depending on particular forms or applications. It commonly occurs in its crystalline polymorphic phase Î±-Al 2 O 3, in which it composes the mineral corundum, varieties of which form the precious gemstones ruby and sapphire.
rain cloud. (meteorology). Any cloud from which rain falls; a popular term having no technical denotation. 1  Facebook. 2  Twitter.
Report Abuse. Clouds are a mixture of gas and liquid or gas and solid. The gas is air. The liquid/solid is water. At high altitude, the water in clouds is frozen. Often, raindrops form as ice pellets that melt on their way down.eport Abuse. Clouds are a mixture of gas and liquid or gas and solid. The gas is air. The liquid/solid is water. At high altitude, the water in clouds is frozen. Often, raindrops form as ice pellets that melt on their way down.