Corundum - Wikipedia
Corundum is a crystalline form of aluminium oxide (Al2O3) 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 ] .
Corundum Value, Price, and Jewelry Information - International …
Corundum Value, Price, and Jewelry Information. Next to diamond, corundum is the hardest mineral known and is very compact and dense, with no cleavage. As a result, corundum is one of the best of all jewelry stones, especially star corundum, which is …
Corundum: Use as a Gemstone, Abrasive, Refractory - Geology.com
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.
The Mineral corundum - The Mineral and Gemstone Kingdom
The Mineral corundum. Corundum is best known for its gem varieties, Ruby and Sapphire. Ruby and Sapphire are scientifically the same mineral, but just differ in color. Ruby is the red variety, and Sapphire is the variety that encompasses all other colors, although the most popular and valued color of Sapphire is blue.
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.
GIA's Gubelin Gem Project: Corundum
Originating historically in southeast and central Asia, and more recently in eastern Africa, these colored varieties of the mineral corundum have been much sought as gems because of their rarity, color and durability.
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。
倾听矿物的声音——刚玉 - 知乎 - 知乎专栏
刚玉（corundum）一词源于印度泰米尔语Kurundam和梵文词Kurivinda、Kurivida。 中文名称则有坚硬之意。 在我国元代陶宗仪著的《辍耕录》有红雅姑、青雅姑、黄雅姑、白雅姑之说，指的就是红、蓝、黄、白色刚玉宝石（雅姑是阿拉伯语宝石的音译）。
Corundum Gem Guide and Properties Chart - Gemstones.com
This Corundum gemstone guide lists qualities of the Corundum gem type, including stone colors, common names, meanings, gemstone hardness and more.
Intriguing minerals: corundum in the world of rubies and
2021年4月28日 · This lecture text presents features of the fascinating mineral corundum and its gem varieties, ruby and sapphire. The geologic occurrences of its varieties and the best-known world localities are presented in detail. The mineralogy and crystallography of corundum, as well as its occurrence forms, are discussed.