Pumice
March 25, 2013 | Geology.com
Pumice is a light-colored, extremely porous, igneous rock that forms during explosive volcanic eruptions. It... Volcanology Etymology
April 23, 2012 | Magma Cum Laude
Jessica Ball has a blog post that explores the origin of some of the most... Pyroclastic Flow on Shiveluch Volcano
February 28, 2012 | NASA Earth Observatory
"Dark volcanic debris mars the otherwise pristine lower flanks of Shiveluch Volcano in this false-color... Volcanoes in Arizona?
March 21, 2012 | ArizonaExperience.org
"While there are no active volcanoes in Arizona, there are volcanic fields capable of producing... Colored Stones Gaining Ground on Diamonds
November 15, 2012 | Business Week
In the 1940's colored stones dominated the gemstone market, then marketing genius launched diamonds far... Volcano Notification Service from USGS
October 10, 2012 | USGS
FROM USGS: VNS is a free service that sends email notifications about the status... Screening for Synthetic and Colored Diamonds
July 17, 2012 | Gemological Institute of America
Undisclosed synthetic diamonds and color treatments are a huge problem in the diamond trade. ... Explosion in the Demand for Frac Sand
July 9, 2012 | Geology.com
The typical well drilled with hydraulic fracturing requires about 500 tons of high performance sand... | 
