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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Battle of Puebla. Cinco de Mayo. General Porfirio Diaz leads Mexican cavalry to victory against the French lead by General Charles Lorencez at Puebla, Mexico April 2, 1867. Oil on canvas, 1902. May 5, 1862. General Ignacio Zaragoza

Candles Burning On Table In Church

What Is the Most Widely Practiced Religion in the World?

Close up of praying mantis walking on stone ground against a blurred background in Japan

6 Animals That Eat Their Mates

Pregnancy. pregnancy and birth. Fertilization, Pregnancy, and Birth. Stages of nine month pregnant woman abdomen growth. Pregnant human female developing human within her. White pregnant female, developing fetus. mother

9 Bizarre Myths About Pregnancy

Thumbnail for flags that look alike quiz Russia, Slovenia, Iceland, Norway

Flags That Look Alike

Computer mapping, woman at early 1990s computer

Timeline of the 1990s

Portrait of Marie Antoinette by Jean-Francois Janinet, 1777. Color etching and engraving with gold leaf printed on two sheets, 30x13.5 in.

Did Marie-Antoinette Really Say “Let Them Eat Cake”?

quartz: Related Content

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

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Quiz

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