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Novaculite

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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; < L novācul(a) a sharp knife, razor + -ite 1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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no·vac·u·lite   (nō-vāk'yə-līt')   
n.  A very hard, dense, even-textured, silica-bearing sedimentary rock used in whetstones.

[Latin novācula, razor + -ite1.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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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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