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gehlenite
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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
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
Solar system illustration. (planets; sun)
Why Are Planets Round?
Spiral Galaxy type Sa-Sb or Sa/Sb in the constellation Virgo. The majestic Sombrero Galaxy Messier 104 (M104) or NGC 4594. The team took six pictures of the galaxy, stitched them together to create the final composite image. Photo from May-June 2003
9 Britannica Articles That Explain the Meaning of Life
Solar System with the sun and planets amid stars. Illustration Venus Mercury Earth Mars Jupiter Saturn Neptune Uranus space orbit
Understanding Kepler’s Laws of Planetary Motion
Discover
Colorful winter sunset
What's the Difference Between a Solstice and an Equinox?
The Prado Museum facade at the Diego Velaszquez memorial. Established in 1819, the museum is considered the best collection of Spanish art and one of the world's finest collections of European art. Madrid, Spain
20 Paintings You Have to Visit at the Museo del Prado in Madrid
Facsimile of one of William Henry Ireland's forgeries, a primitive self-portrait of William Shakespeare(tinted engraving). Published for Samuel Ireland, Norfolk Street, Strand, December 1, 1795. (W.H. Ireland, forgery)
The Time a Law Clerk Successfully Forged a New Shakespeare Play to Impress His Dad
Town of Sisimiut located on the coast of the Davis Strait on Kangerluarsunnguaq Bay, Greenland
The Largest Islands in the World
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
Four year old boy with grandfather and father lighting Hanukkah menorah. Photo taken on: December 21st, 2009
Which Is Correct: Hanukkah or Chanukah?
The impeachment trial of Pres. Andrew Johnson, illustration from Frank Leslie's Illustrated Newspaper, March 28, 1868.
What If the President Is Impeached?

gehlenite

mineral
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melilite

gehlenite, mineral composed of calcium aluminum silicate, Ca2Al2SiO7, one end-member of the melilite mineral series (see melilite).