geyserite

 [gahy-zuh-rahyt, -suh-]  

gey·ser·ite

   [gahy-zuh-rahyt, -suh-]
noun Petrology.
a variety of siliceous sinter deposited about the orifices of geysers and hot springs.
Origin:
1805–15; geyser + -ite1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Geyserite is always a great word to know.
So is gobo. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
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Collins
World English Dictionary
geyserite (ˈɡiːzəˌraɪt)
 
—n
a mineral form of hydrated silica resembling opal, deposited from the waters of geysers and hot springs. Formula: SiO2.nH2O

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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