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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
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Planet Earth and lunar moon from space
Where Did the Moon Come From?
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
Chemical equations Chemical reactions chemistry
How Do You Balance a Chemical Equation?
1 July 2002: The Solar and Heliospheric Observatory (SOHO) satellite reveals a massive solar eruption more than 30 times the Earth's diameter. The eruption formed when a loop of a magnetic field over the surface of the Sun trapped hot gas.
6 Questions About the Sun Answered
Discover
The impeachment trial of Pres. Andrew Johnson, illustration from Frank Leslie's Illustrated Newspaper, March 28, 1868.
What If the President Is Impeached?
Colorful winter sunset
What's the Difference Between a Solstice and an Equinox?
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
Coriander leaves, fresh green cilantro on wooden background, herbs
Why Does Cilantro Taste Like Soap to Some People?
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
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
Panama Canal infographic
Timeline and Map of the Panama Canal
brookite
brookite

brookite

mineral
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brookite, one of three minerals composed of titanium dioxide (TiO2) (see also rutile; anatase). It typically occurs as brown, metallic crystals in veins in gneiss and schist; it is also found in placer deposits and, less commonly, in zones of contact metamorphism. It is widespread in veins in the Alps; in Fronolen, north Wales, it forms crystals on crevice walls in diabase. Brookite forms crystals that belong to the orthorhombic system. For detailed physical properties, see oxide mineral (table).

This article was most recently revised and updated by Amy Tikkanen.