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amethyst
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Amethyst A sample of amethyst, trigonal silicon oxide, from Amatitlán, Guerrero, Mex. Amethyst geode from Nova Scotia, Can.
Quizzes
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
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Cold Stones: 9 Gems That Will Make You Feel Like a Peasant
If You'd Only Be My Valentine, American Valentine card, 1910. Cupid gathers a basket of red hearts from a pine tree which, in the language of flowers represents daring. Valentine's Day St. Valentine's Day February 14 love romance history and society heart In Roman mythology Cupid was the son of Venus, goddess of love (Eros and Aphrodite in the Greek Pantheon).
Why Do We Give Valentine Cards?
Calendar showing the month of February
Why Are There Only 28 Days in February?
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Town of Sisimiut located on the coast of the Davis Strait on Kangerluarsunnguaq Bay, Greenland
The Largest Islands in the World
Ruminant. Deer. Red deer. Cervus elaphus. Buck. Stag. Antlers.
9 of the World’s Deadliest Mammals
Colorful winter sunset
What's the Difference Between a Solstice and an Equinox?
The Jeff Koons tulips sculputure outside the Guggenheim Museums in Bilbao, Spain, Basque Country.
What’s the Difference Between Modern and Contemporary Art?
Ice Sledge Hockey, Hockey Canada Cup, USA (left) vs Canada, 2009. UBC Thunderbird Arena, Vancouver, BC, competition site for Olympic ice hockey and Paralympic ice sledge hockey. Vancouver 2010 Olympic and Paralympic Winter Games, Vancouver Olympics
10 Best Hockey Players of All Time
Hemp (Cannabis sativa).
9 Mind-Altering Plants
Christmas tree, holiday, pine
How Did the Tradition of Christmas Trees Start?

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Amethyst
© Erica and Harold Van Pelt Photographers
A sample of amethyst, trigonal silicon oxide, from Amatitlán, Guerrero, Mex.
Photograph by Sandy Grimm. Houston Museum of Natural Science, ED 60 Z
Amethyst geode from Nova Scotia, Can.
Emil Javorsky/Encyclopædia Britannica, Inc.
VIEW MORE in these related Britannica articles: