IPA: /nəˈvɑːkjʊˌlaɪt/
KK: /nəˈvɑːkjʊˌlaɪt/
A type of very hard rock that is fine-grained and contains silica, often used to make whetstones for sharpening tools.
The craftsman used a piece of novaculite to sharpen his knives.
Novaculite is formed from "novacula" (from Latin, meaning razor) and the suffix "-ite" (meaning a type of rock or mineral). The word refers to a type of fine-grained sedimentary rock that can be sharpened like a razor.
Think of 'razor' ('novacula') to remember that 'novaculite' is a rock that can be sharpened like a razor.
No commonly confused words.