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Boracite
is always a great word to know.
So is ort. Does it mean:
| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
| a scrap or morsel of food left at a meal. |
Collins
Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Encyclopedia Britannica
Encyclopedia
boracite
colourless, glassy borate mineral, magnesium chloroborate (Mg3B7O13Cl). It has been found as crystals embedded in sedimentary deposits of anhydrite, gypsum, and halite. A massive variety occurs as nodules in the salt-dome deposits at Stassfurt, Ger., where it has been mined as a source of boron. For detailed physical properties, see borate mineral (table)
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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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