tephrite

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Martin Luther King, Jr.

Why We Celebrate MLK Day

Secret Service Agent Listens To Earpiece

Secret Service Code Names of 11 U.S. Presidents

Panoramic view of moai, Ahu Tongariki, Easter Island (Rapa Nui), Chile

8 of the World’s Most-Remote Islands

The Lost Colony of Roanoke, North Carolina, where 115 people mysteriously disappeared c. 1590. John White discovers the word Croatoan carved onto a tree upon his return to the deserted Roanoke Colony in 1590

The Lost Colony of Roanoke

Apollo 12 astronaut Charles "Pete" Conrad stands beside the U.S. flag after is was unfurled on the lunar surface during the first extravehicular activity (EVA-1) Nov. 19, 1969. Footprints made by the crew can be seen in the photograph.

How Many People Have Been to the Moon?

Panoramic view at sunrise of moai, Ahu Tongariki, Easter Island (Rapa Nui), Chile

6 Lost Civilizations

A Factory Interior, watercolor, pen and gray ink, graphite, and white goache on wove paper by unknown artist, c. 1871-91; in the Yale Center for British Art. Industrial Revolution England

Inventors and Inventions of the Industrial Revolution

tephrite

geology

Learn about this topic in these articles:

association with basanite

In basanite
Basanites and tephrites occur as gray to black rocks in sheets and flows. Places where basanites are found include Spain, Hungary, Italy, New Zealand, and the southwestern United States; tephrites are found in Germany, Italy, Portugal, Greenland, Uganda, and Colorado.
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