be found in ancient Precambrian rock in the Canadian Shield; specifically, the Avalon and Burin Peninsulas?
This may be corundum
since its XRD pattern is closely equivalent to that of the corundum
 as main peaks can be seen around 28 = 25 (3.
Impact bricks were laid in the lashed area and then the corundum
castable was poured.
A similar tendency variation of tribological behaviour of the studied material against corundum
was exhibited, in reference , in which the highly pure [Ti.
stone mills can be supplied in either an offline or an online version.
For example, sapphires and rubies are actually the same mineral, corundum
Nanoscale inorganic particles include indium tin oxide, silica, zirconium, corundum
, aluminum hydroxide, zinc oxide, titanium dioxide, and carbon black; particle sizes range from 4 to 1000 nm.
1982, Electric field gradients and charge density in corundum
El rubi, ademas de ser una gema preciosa en su forma de corundum
(forma de mineral de la que se derivan los zafiros y rubies), es una sustancia muy util para estudios opticos y puede ser sintetizada; su estructura es muy simple para estudiar y ademas los iones de cromo tienen propiedades magneticas y opticas que se utilizan facilmente.
For instance, Cleopatra's favourite stone was the emerald, Queen Victoria started wearing 'Jet' jewellery after the death of her husband, Helen of Troy is said to have worn star corundum
, which is a powerful love charm.
the Keystone Trappe Rock quarry at Cornog (exquisite small specimens of Alpine-type cleft minerals), Brinton's quarry at Darlington's Corners (the world's best large clinochlore crystals), the Poorhouse quarry, West Bradford Township (excellent microcline), Corundum
Hill, Newlin Township (good corundum
and superb diaspore crystals), the fields around Parkesburg where line rutile crystals may still be found loose in the soil.
In terms of actual hardness, corundum
is twice as hard as topaz.