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Pyrolusite

Geology Page - July 10, 2014

Gold

Geology Page - April 19, 2015

Pyrite

Geology Page - July 9, 2014

Polybasite

Geology Page - July 3, 2014

Pyroaurite

Geology Page - July 9, 2014

Emerald

Geology Page - February 25, 2014

Platinum

Geology Page - April 25, 2015

Diamond

Diamond

Geology Page - September 1, 2014

Lazurite

Geology Page - May 20, 2014

Pseudobrookite

Geology Page - July 7, 2014

Geode

Geology Page - March 29, 2013

Hematite

Geology Page - April 19, 2014

Pyrope

Geology Page - July 13, 2014

Adamite

Geology Page - January 16, 2012

Lazulite

Geology Page - May 20, 2014

Acanthite

Geology Page - February 20, 2012

Fluorite

Geology Page - March 19, 2014

Opal

Geology Page - June 20, 2014

Euclase

Geology Page - March 6, 2014

Crocoite

Geology Page - December 30, 2013

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MOST POPULAR

Zambezi River

November 25, 2014

Two ancient human fossils from Laos reveal early human diversity

April 9, 2015

An artist's impression of a New Zealand burrowing bat, Mystacina robusta, that went extinct last century.

Giant extinct burrowing bat discovered in New Zealand

January 10, 2018

Lakes in the roadless Minto Flats surround the Tanana River in this photo from July 2014.

Scientists find pre-earthquake activity in central Alaska

June 5, 2018

MORE ARTICLES

A map summarizing the new REEF measure of seismic energy for events around the Pacific Ring of Fire shows the regional patterns indicating earthquake rupture character is affected by persistent features that differ from region to region.

Seismologists introduce new measure of earthquake ruptures

Mount Hood

Scientists argue for more comprehensive studies of Cascade volcanoes

paleoseismological record of the Liquiñe-Ofqui Fault Zone (LOFZ)

Researchers discover evidence of earthquakes that affected Chilean coast in the...

Earthquakes can make thrust faults open violently and snap shut