Aluminium oxide (Al 2 O 3) occurs in two major forms. α-Al 2 O 3 [corundum; CAS No ] constitutes a high temperature form and is formed on heating aluminium hydroxide, Al(OH) 3, at a temperature of 1000 °C or above.

A new carbonate-hosted gem corundum locality northwest of Revelstoke in British Columbia (at 51° 31.3′ N, 118° 46.7′ W, 82M/10; Fig. 1) was staked as the Goat claims by Bradley S. Wilson in 2002.Several gem-quality sapphires and rubies from this locality have been faceted with the largest under 0.5 ct. (Appendix A, Suppl. Fig. A1).In this contribution we characterize the geology ...

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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. 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. Corundum has two primary gem varieties: ruby and sapphire.

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.

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Formula: A (D 3 )G 6 (Si 6 O 18 ) (BO 3) 3 X 3 Z. Locality: McCoy mine, Raglan Township, Renfrew County, Ontario, Canada. Reference: Ann P.Sabina (2007), Rocks and Minerals for the Collector, Ottawa to North Bay and Huntsville, Ontario; Gatineau (Hull) to …

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GIULIANI ET AL. ( GEM CORUNDUM 29 CHAPTER 2: THE GEOLOGY AND GENESIS OF GEM CORUNDUM DEPOSITS Gaston Giuliani1, 2, Daniel Ohnenstetter2, Anthony E. Fallick3, Lee Groat4, Andrew J. Fagan5,4 1 ...

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Hematite. Hematite, an iron oxide, is the most common black or brownish-black mineral in sedimentary and low-grade metasedimentary rocks. It varies greatly in form and appearance, but all hematite produces a reddish streak. Characteristics: Dull to semimetallic luster; hardness of 1 to 6.

Gem minerals at Lava Plains, northeast Queensland, offer further insights into mantle-crustal gemformation under young basalt fields. Combined mineralogy, U-Pb age determination, oxygen isotope and petrological data on megacrysts and meta-aluminosilicate xenoliths establish a geochemical evolution in sapphire, zircon formation between 5 to 2 Ma.

Page 152 - Report on a part of northern Alberta, and portions of adjacent districts of Assiniboia and Saskatchewan. Appears in 40 books from 1883-2003 Page 23 - Andrews informed me that a very beautiful diamond of considerable size, like a small chinkapin, and of black color, had been found at the same locality, by three persons, while washing ...

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Last year any black/yellow plates were issued. 1976 – year-round registration started, which requires a month expiration sticker affixed to the upper left hand corner of the plate. 1982 – standard plate changed to a white background with blue characters with a sun graphic and "California" in red block letters.

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Corundum crystals are generally hexagonal, either tabular, tapering barrel-shaped, or dipyramidal. Corundum can also be massive or granular. It forms in syenites certain pegmatites and in high-grade metamorphic rocks. It is concentrated in placer deposits. Name: Probably from the Sanskrit kurivinda, for ruby, through the Tamil kurundam.

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Ruby, Sapphire, and Fancy Sapphire. Most people don't realize that ruby and sapphire are both gems of the mineral corundum.Both of these gemstones have the same chemical composition and the same mineral structure. Trace amounts of impurities determine if a gem corundum will be a brilliant red ruby or a beautiful blue sapphire.

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Black corundum pyramids have been found associated with basaltic tuffs near Diégo-Suarez. At Betsiriry, bluish to grayish corundum is found associated with muscovite (Barlow, 1915). Lacroix visited one alluvial gold locality southwest of Ambositra, in the bed of the small Ifèmpina river, where rolled corundum pebbles were found.