Corundum - Wikipedia
Corundum occurs as a mineral in mica schist, gneiss, and some marbles in metamorphic terranes. It also occurs in low-silica igneous syenite and nepheline syenite intrusives. Other occurrences are as masses adjacent to ultramafic intrusives, associated with lamprophyre dikes and as large crystals in pegmatites. [ 6 ]
Corundum: Use as a Gemstone, Abrasive, Refractory - Geology.com
What is Corundum? Corundum is a rock-forming mineral that is found in igneous, metamorphic, and sedimentary rocks. It is an aluminum oxide with a chemical composition of Al 2 O 3 and a member of the trigonal crystal system.
Corundum | Properties, Formation, Uses » Geology Science
2024年7月1日 · Corundum is a mineral that is primarily composed of aluminum oxide (Al2O3) and is one of the naturally occurring crystalline forms of aluminum oxide. It is a very hard mineral and is commonly used as an abrasive in various industrial applications.
The Mineral corundum - The Mineral and Gemstone Kingdom
Corundum is a very hard, tough, and stable mineral. For all practical purposes, it is the hardest mineral after Diamond, making it the second hardest mineral. It is also unaffected by acids and most environments. Translucent brown Corundum …
Corundum | Aluminum Oxide, Gemstone, Abrasive | Britannica
2024年10月15日 · corundum, naturally occurring aluminum oxide mineral (Al 2 O 3) that is, after diamond, the hardest known natural substance. Its finer varieties are the gemstones sapphire and ruby (qq.v.), and its mixtures with iron oxides and other minerals are called emery (q.v.). Corundum in its pure state is colourless, but the presence of small amounts of ...
Corundum - Minerals Education Coalition
Corundum is a crystalline form of aluminum oxide (Al2O3) with traces of iron, titanium and chromium. It is a rock-forming mineral. It is one of the naturally transparent materials, but can have different colors when impurities are present.
剛玉 - 维基百科，自由的百科全书
剛玉 （英語： corundum）是一種由 氧化鋁 （Al 2 O 3）的結晶形成的成岩矿物。 刚玉常含有少量的 铁 、 钛 、 钒 和 铬 离子 [2][3]。 纯氧化铝结晶是无色的，但因为所含杂质不同，刚玉呈现不同的颜色。 寶石級剛玉之中，摻有金屬 鉻 的剛玉顏色鮮紅，一般稱之為 紅寶石；而藍色或沒有色的剛玉，普遍都會被歸入 藍寶石 的類別。 刚玉的英文名corundum源于 泰米尔语 的குருந்தம்（羅馬化：Kuruntam），起源于梵文的कुरुविन्द（羅馬 …
Geology of Corundum and Emerald Gem Deposits: A Review
2020年1月31日 · Corundum and zircon are resistant minerals found in soils, laterite, and gravelly levels overlying bedrock. Of particular importance are paleoplacers characterized by different mineral phases cemented in a carbonate or silica-rich matrix.
Corundum: Mineral information, data and localities. - mindat.org
Most commonly refers to a blue gem variety of corundum, but other coloured varieties of corundum are also described as sapphire, except red corundum, which is better known as Ruby. Star Corundum A variety of corundum exhibiting a …
Corundum | Earth Sciences Museum - University of Waterloo
Corundum is a very hard, tough and stable mineral. For all practical purposes, it is the hardest mineral, second only to diamond. It is unaffected by acids and most environments. The name corundum was first derived either from the Sanskrit word Kuirvinda or from the Indian name for corundum, Kauruntoka. Formation: