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dioptase

American  
[dahy-op-teys] / daɪˈɒp teɪs /

noun

  1. a mineral, hydrous copper silicate, CuSiO 3 ⋅H 2 O, occurring in emerald-green crystals.

dioptase British  
/ -teɪz, daɪˈɒpteɪs /

noun

  1. a green glassy mineral consisting of hydrated copper silicate in hexagonal crystalline form. Formula: Cu 6 Si 6 O 18 .6H 2 O

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of dioptase

1795–1805; < French, equivalent to di- di- 3 + Greek optasía view

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The following minerals, according to Griffin, produce beads with soda, but do not fuse when heated alone: quartz, agalmatolyte, dioptase, hisingerite, sideroschilosite, leucite, rutile, pyrophyllite, wolckonskoite.

From A System of Instruction in the Practical Use of the Blowpipe Being A Graduated Course Of Analysis For The Use Of Students And All Those Engaged In The Examination Of Metallic Combinations by Anonymous

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.