troilite

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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?

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?

Astronomical Observatory of the Mojon del Trigo. Long exposure using the star trail technique. Sierra Nevada National Park, in the province of Granada, Andalusia.

Is Earth Going to Change the Direction in Which It Rotates?

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Stylish light blue jeans on wooden background, closeup of inset pocket

Why Do Jeans Have That Tiny Pocket?

Four year old boy with grandfather and father lighting Hanukkah menorah. Photo taken on: December 21st, 2009

Which Is Correct: Hanukkah or Chanukah?

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

Indian hijras participate in a religious procession in Gandhinagar, India, some 30 kilometers from Ahmedabad, on March 22, 2017. Hijra is a term used in South Asia which refers to transgender individuals who are born male. (gender identity, gender expression)

6 Cultures That Recognize More than Two Genders

Nativity Scene, Adoration of the Magi, Church of the Birth of the Virgin Mary, Montenegro

Why Is Christmas in December?

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

King Cobra snake in Malaysia. (reptile)

9 of the World’s Deadliest Snakes

troilite

mineral

Written and fact-checked by The Editors of Encyclopaedia Britannica

Article History

Related Topics:: pyrrhotite

troilite, variety of the iron sulfide mineral pyrrhotite (q.v.) present in meteorites.

This article was most recently revised and updated by John P. Rafferty.