dumortierite
noun
du·mor·ti·er·ite
du̇-ˈmȯr-tē-ə-ˌrīt 
also dyu̇-
: a bright especially blue mineral consisting of a borosilicate of aluminum
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The standout features are dials decorated with Roman numerals cut directly in jasper, jade, and dumortierite, to match the colors of the cabochons on the winding crowns.
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Justin Fenner, Robb Report, 27 Mar. 2023
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Justin Fenner, Robb Report, 27 Mar. 2023
Cite this Entry
“Dumortierite.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/dumortierite. Accessed 31 Oct. 2025.
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