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nepheline
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Nepheline from Litchfield, Maine alkalic syenite
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
Related Questions
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solar eclipse, sun, moon, astronomy, space
How Do You Tell the Difference Between Total, Annular, Solar, and Lunar Eclipses?
Arrangement of the phases of the moon in total eclipse with Blood Moon
9 Celestial Omens
Galaxy clusters like Abell 2744 can act as a natural cosmic lens, magnifying light from more distant, background objects through gravity. NASA's James Webb Space Telescope may be able to detect light from the first stars in the universe if they are gravitationally lensed by such clusters. (astronomy, space exploration, galaxies)
How Fast Is the Universe Expanding?
Solar system illustration. (Sun; planets)
A Model of the Cosmos
Colorful winter sunset
What's the Difference Between a Solstice and an Equinox?
Discover
Stylish light blue jeans on wooden background, closeup of inset pocket
Why Do Jeans Have That Tiny Pocket?
Town of Sisimiut located on the coast of the Davis Strait on Kangerluarsunnguaq Bay, Greenland
The Largest Islands in the World
Hemp (Cannabis sativa).
9 Mind-Altering Plants
Four year old boy with grandfather and father lighting Hanukkah menorah. Photo taken on: December 21st, 2009
Which Is Correct: Hanukkah or Chanukah?
Saint Lucia Day. Young girl wears Lucia crown (tinsel halo) with candles. Holds Saint Lucia Day currant laced saffron buns (lussekatter or Lucia's cats). Observed December 13 honor virgin martyr Santa Lucia (St. Lucy). Luciadagen, Christmas, Sweden
7 Winter Solstice Celebrations From Around the World
The Jeff Koons tulips sculputure outside the Guggenheim Museums in Bilbao, Spain, Basque Country.
What’s the Difference Between Modern and Contemporary Art?
Close-up of ostriches (Struthio camelus) necks and heads; location unknown.
6 of the World's Most Dangerous Birds

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Nepheline from Litchfield, Maine
Courtesy of the Field Museum of Natural History, Chicago, photograph, John H. Gerard/Encyclopædia Britannica, Inc.
alkalic syenite
Nepheline (greasy light gray), sodalite (blue), cancrinite (yellow), feldspar (white),...
Courtesy of Northwestern University Geology Department, Evanston, Illinois; photograph, Katherine H. Jensen/Encyclopædia Britannica, Inc.
VIEW MORE in these related Britannica articles: