1
: a mineral consisting of silicon dioxide occurring in colorless and transparent or colored hexagonal crystals or in crystalline masses
2
: a quartz crystal that when placed in an electric field oscillates at a constant frequency and is used to control devices which require precise regulation
a quartz watch
Examples of quartz in a Sentence
Recent Examples on the Web
Located on Siesta Key near downtown Sarasota on the state's west coast, this kid-friendly beach has a wide expanse of soft, powdery white, quartz-crystal sand that somehow doesn’t get hot in the Florida sun.
—
Beth Luberecki, USA Today, 31 Jan. 2026
That means long-standing favorites—yes, even predictable quartz slabs—are falling out of favor.
—Lauren Jones, Southern Living, 31 Jan. 2026
The former is caused by manganese garnet sediment and quartz that wash down from nearby cliffs, giving the sand an amethyst-like radiance.
—Alanna Bennett, Condé Nast Traveler, 26 Jan. 2026
Marshall became part owner of a quartz mine near Kelsey.
—Kurt Snibbe, Oc Register, 24 Jan. 2026
See All Example Sentences for quartz
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Beth Luberecki, USA Today, 31 Jan. 2026
That means long-standing favorites—yes, even predictable quartz slabs—are falling out of favor.
—Lauren Jones, Southern Living, 31 Jan. 2026
The former is caused by manganese garnet sediment and quartz that wash down from nearby cliffs, giving the sand an amethyst-like radiance.
—Alanna Bennett, Condé Nast Traveler, 26 Jan. 2026
Marshall became part owner of a quartz mine near Kelsey.
—Kurt Snibbe, Oc Register, 24 Jan. 2026
See All Example Sentences for quartz
Cite this Entry
“Quartz.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/quartz. Accessed 14 Feb. 2026.
Copy CitationKids Definition
quartz
noun
: a common mineral consisting of silicon dioxide that is often found in the form of colorless transparent crystals but is sometimes (as in amethysts, agates, and jaspers) brightly colored
Medical Definition
quartz
noun
: a mineral SiO2 consisting of a silica that occurs in colorless and transparent or colored hexagonal crystals and also in crystalline masses
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