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Origin of spinel
Words nearby spinel
Example sentences from the Web for spinel
The rock—which also contains the plain-old mineral plagioclase—includes pink spinel, a prized jewel on Earth.Space Bling: From Diamond Planets to Crystal Oceans to Precious Moon Jewels|Alexa Valiente, Jaewon Kang|October 13, 2012|DAILY BEAST
The rubies of Burma are found in crystalline limestones and are constantly accompanied by precious spinel (or balas-ruby).
Some of the alumina and iron oxide may occasionally be chemically combined, so as to form an iron spinel, or hercynite.
Then follows the topaz, which, with spinel and chrysoberyl, has a hardness of 8; whilst quartz falls a degree lower.
Mention has been made above of a stone frequently substituted for the true ruby, called the “spinel” or “balas” ruby.
The spinel and ruby occur together in nature, stones from Burma being as often spinel as true Oriental ruby.