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novaculite

[noh-vak-yuh-lahyt]

no·vac·u·lite

[noh-vak-yuh-lahyt]
noun Petrology.
a very hard sedimentary rock, similar to chert, composed essentially of microcrystalline quartz.

Origin:
1790–1800; < Latin novācul(a) a sharp knife, razor + -ite1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Novaculite is always a great word to know.
So is callithumpian. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a stew of meat, vegetables, potatoes, etc.
Collins
World English Dictionary
novaculite (nəʊˈvækjʊˌlaɪt)
 
n
a fine-grained dense hard rock containing quartz and feldspar: used as a whetstone
 
[C18: from Latin novācula sharp knife, razor, from novāre to renew]

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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Encyclopedia Britannica
Encyclopedia

novaculite

very dense, light-coloured, even-textured sedimentary rock, a bedded chert in which microcrystalline silica (silicon dioxide, SiO2) in the form of quartz predominates over silica in the form of chalcedony. Deposits of novaculite exhibit stratification. The name is applied chiefly to formations in Arkansas, Oklahoma, and Texas. See also chert and flint.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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