quartz

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A sample of amethyst, trigonal silicon oxide, from Amatitlán, Guerrero, Mex.

quartz with hematite inclusions

Quartz agates from Mexico.

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Artist interpretation of space asteroids impacting earth and moon. Meteoroids, meteor impact, end of the world, danger, destruction, dinosaur extinct, Judgement Day, Doomsday Predictions, comet

Major Mass Extinctions

African Americans demonstrating for voting rights in front of the White House as police and others watch, March 12, 1965. One sign reads, "We demand the right to vote everywhere." Voting Rights Act, civil rights.

Timeline of the American Civil Rights Movement

Nelson Mandela, undated photo.

15 Nelson Mandela Quotes

Scolex (head) of the tapeworm Taenia solium. The hooks of the scolex enable the tapeworm to attach to the intestinal wall.

Uninvited Guests: The 7 Worst Parasitic Worms

Salem Witch Trials. Photogravure after the painting by Walter McEwen titled - The Witches - circa 1890s.

How Rye Bread May Have Caused the Salem Witch Trials

New York NY/ USA- November 23, 2018 Hordes of shoppers throng the Macy's Herald Square flagship store in New York looking for bargains on the day after Thanksgiving, Black Friday.

Why Is It Called Black Friday?

Paul Revere. "The bloody massacre perpetrated in King Street Boston on March 5th 1770 by a party of the 29th Regt.," engraved by Paul Revere. Boston Massacre.

There’s a Riot Goin’ On: Riots in U.S. History (Part One)

quartz: Related Content

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Last Updated: Jun 02, 2025

News •

North Carolina Town Has Some of the Purest Quartz That Powers the World’s Tech • May 31, 2025, 7:39 AM ET (New York Times)

Photos and Videos

A sample of amethyst, trigonal silicon oxide, from Amatitlán, Guerrero, Mex.

quartz with hematite inclusions

Quartz agates from Mexico.

Learn about sands, which are formed from quartz and also the formation of smooth, sandy beaches

Learn about the mining and purification of silicon

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Topics

high quartz quartz cat’s-eye left-handed quartz fused quartz low quartz right-handed quartz flint chert and flint jasper amethyst opal coesite tridymite cristobalite stishovite

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Basalt sample returned by Apollo 15, from near a long sinous lunar valley called Hadley Rille. Measured at 3.3 years old.

(Bed) Rocks and (Flint) Stones