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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]
Kyanite is a typically blue aluminosilicate mineral, found in aluminium-rich metamorphic pegmatites and sedimentary rock. It is the high pressure polymorph of andalusite and sillimanite, and the presence of kyanite in metamorphic rocks generally indicates metamorphism deep in the Earth's crust. Kyanite is also known as disthene or cyanite. [5]
The mine shaft was 280 feet (85 m) deep and contained two Yogo ore-bearing veins. [84] The portion of the dike they had mined was an extension of the main dike. [85] The Vortex Mine, renamed Yogo Creek Mining, [18] was successful for years but eventually declined and closed in 2004. [85] A 0.19-carat (0.038 g) diamond cut cornflower blue Yogo ...
In 1876, the mountain was discovered as a source for corundum. In 1900, mining operations began by the Canada Corundum Company. A settlement, consisting of both a company town and a private town, grew to a peak population of 600 persons, making it the world's largest Corundum producer at that time.
At Aappaluttoq, the ruby and pink sapphire mineralization occurs in a corundum (ruby-sapphire) alteration band that exhibits trench-to-trench and drill hole-to-drill hole continuity. This corundum band is contained within a broader phlogopite and pargasite-enriched alteration zone referred to as the Host Zone Alteration. The ruby mineralization ...
Emery mine on Naxos Island Corundite from the Naxos emery deposits. The corundum is blue, or sapphire. Wet slab, 10 cm (3.9 in) wide. Emery, or corundite, is a dark granular rock used to make an abrasive powder. The rock largely consists of corundum (aluminium oxide), mixed with other minerals. Industrial emery may contain a variety of other ...
Amethyst crystals – a purple quartz Apophyllite crystals sitting right beside a cluster of peachy bowtie stilbite Aquamarine variety of beryl with tourmaline on orthoclase Arsenopyrite from Hidalgo del Parral, Chihuahua, Mexico Aurichalcite needles spraying out within a protected pocket lined by bladed calcite crystals Austinite from the Ojuela Mine, Mapimí, Durango, Mexico Ametrine ...
The Rock Flat Mine lies in the drainage of the Rock Flat Placer through the Little Goose Creek Canyon. [1] It is a small placer mine in central Idaho . it primarily produces gold , corundum , spinel , and topaz .