The relatively pure crystals are called corundum, while emery is. From Wordnik.com. [An Elementary Study of Chemistry] Reference
Herein also is the kind of corundum known as emery, and esteemed for its polishing properties. From Wordnik.com. [How to See the British Museum in Four Visits] Reference
Oats and corundum both came according to prophecy. From Wordnik.com. [Lippincott's Magazine, Vol. 22, September, 1878] Reference
The green stone was therefore not a green corundum. From Wordnik.com. [A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public] Reference
Leaving the corundum gems we come next to chrysoberyl. From Wordnik.com. [A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public] Reference
Pink stones are yielded by (1) corundum (pink sapphire). From Wordnik.com. [A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public] Reference
I am harder than a diamond sword sunk in a corundum anvil. From Wordnik.com. [Corporations play hide-and-seek with contact info online] Reference
HK for soft wood and rough lacquer sanding precious corundum. From Wordnik.com. [9. Tools] Reference
Moreover these defects are characteristic of the corundum gems. From Wordnik.com. [A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public] Reference
(Soft to medium-hard corundum wheel with medium grain size.) 9. From Wordnik.com. [3. Recommendations for practical vocational training in the working technique of ''Grinding of Simple Tools''] Reference
NK sharpening of tools made of tool steel semi-precious corundum. From Wordnik.com. [9. Tools] Reference
NK for soft wood and rough plastic sanding semi-precious corundum. From Wordnik.com. [9. Tools] Reference
A (Soft to medium-hard corundum wheel with medium grain size.) 9. From Wordnik.com. [1. Objectives and contents of practical vocational training in the working technique of Grinding of Simple Tools] Reference
The scientific corundum gems, however, never have these specific defects. From Wordnik.com. [A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public] Reference
As was said under ruby, nothing but red corundum should receive that title. From Wordnik.com. [A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public] Reference
Some representative oxide minerals include corundum, cuprite, and hematite. From Wordnik.com. [Composition of rocks] Reference
EK sharpening of tools made of tool steel and high-speed steel ruby corundum. From Wordnik.com. [9. Tools] Reference
The amount of raw corundum used annually by the company reaches nearly 1,000 tons. From Wordnik.com. [Final Report of the Louisiana Purchase Exposition Commission] Reference
Similarly all sapphires, of whatever color, belong to the mineral species "corundum.". From Wordnik.com. [A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public] Reference
The red of the rubellite should not deceive anyone who has ever seen a fine corundum ruby. From Wordnik.com. [A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public] Reference
Spinels, when red, are almost always more yellowish or more purplish than fine corundum rubies. From Wordnik.com. [A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public] Reference
The trainees should be shown the silicon carbide and corundum wheels used for off-hand sharpening. From Wordnik.com. [3. Recommendations for practical vocational training in the working technique of ''Grinding of Simple Tools''] Reference
A reworking of wear-resistant parts is usually only possible with SiC or corundum grinding wheels. From Wordnik.com. [11.1 Welding additives] Reference
This is true whether it has reference to a grindstone, emery, corundum wheel, or a plain oil stone. From Wordnik.com. [Practical Mechanics for Boys] Reference
Perhaps the most common of the defects of natural corundum gems is the peculiar appearance known as. From Wordnik.com. [A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public] Reference
When it remotely suggests emerald it is called "Oriental" emerald to denote that it is a corundum gem. From Wordnik.com. [A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public] Reference
Any of the corundum gems therefore may be used in any type of jewel without undue risk of wear or breakage. From Wordnik.com. [A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public] Reference
In conclusion, then, the points to be remembered in determining the origin of corundum gems are four in number. From Wordnik.com. [A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public] Reference
The surfaces of crystals of corundum are often clouded or dull, whilst its classification of lustre is vitreous. From Wordnik.com. [The Chemistry, Properties and Tests of Precious Stones] Reference
Another common type of defect in corundum gems is the occurrence of patches of milky cloudiness within the material. From Wordnik.com. [A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public] Reference
Purple corundum (Oriental amethyst) is seldom as fine in color as ordinary amethyst, and never as fine as the best amethyst. From Wordnik.com. [A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public] Reference
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