noun Petrology.
a very hard sedimentary rock, similar to chert, composed essentially of microcrystalline quartz.

1790–1800; < Latin novācul(a) a sharp knife, razor + -ite1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
novaculite (nəʊˈvækjʊˌlaɪt)
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
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Encyclopedia Britannica


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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Example sentences
These products are manufactured from novaculite, quartzite, and other microcrystalline quartz rock.
Manufacture of these properties and end uses such as rottenstone and products was from novaculite, quartzite, or novaculite.
One of the ridge-making formations is a cream to yellowish-white, fine-grained, siliceous rock called novaculite.
They quarried novaculite here, as raw material for stone tools.
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