The use of hardness points and scratch plates made of corundum ( hardness 9 ) are also used in place of glass.
42.
This cap may be either synthetic spinel, synthetic corundum, synthetic quartz, or in lower-end productions, glass.
43.
This corundum band is contained within a broader phlogopite and pargasite-enriched alteration zone referred to as the Host Zone Alteration.
44.
The inaugural auction in June 2014 of rough ruby and corundum from the deposit yielded revenues of USD 33.5 million.
45.
Synthetic ( lab created ) corundum, including ruby and sapphire, is very common and costs much less than the natural stones.
46.
In 1901 a prospector from Duluth misidentified the outcrops of anorthosite as corundum, an extremely hard mineral valuable as an industrial abrasive.
47.
The two types of stone are displayed together because they are essentially the same material _ corundum, or aluminum oxide _ Post said.
48.
For example, ruby and sapphire have the same primary chemical composition ( both are corundum ) but exhibit different colors because of impurities.
49.
Vanadium oxide can be used to induce color centers in corundum to create simulated alexandrite jewelry, although alexandrite in nature is a chrysoberyl.
50.
It is the gibbsite layer that in a way forms the " floor plan " for the mineral corundum, Al 2 O 3.
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