no·vac·u·lite (n -v k y -l t )n. A very hard, dense, even-textured, silica-bearing sedimentary rock used in whetstones. [Latin nov  cula, razor + -ite.] |
novaculite [nəʊˈvækjʊˌlaɪt]
n
(Earth Sciences / Geological Science) a fine-grained dense hard rock containing quartz and feldspar: used as a whetstone
[from Latin novācula sharp knife, razor, from novāre to renew]
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