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Scoria, Craters of the Moon National Park & Preserve, 2013.

Scoria used to be called cinder. This pyroclastic rock is made mostly of volcanic materials. Pyroclasts range from the largest agglomerates to very fine ash. These different sizes are classified as volcanic bombs, lapilli and volcanic ash. A cinder is defined by these characteristics: uncemeted, vitric (i.e., resembling glass), having bubble-like cavities or vesicles, typically colored red or black and contains numerous gas bubbles 'frozen' in place as magma exploded into the air and cooled quickly.

U.S. National Park Service

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Craters of the Moon National Monument and Preserve, Code: CRMO

National Park Service Facebook Photos

Title: Craters of the Moon National Monument & Preserve
URL: https://www.facebook.com/CratersoftheMoonNPS?fref=ts

20130219

02/19/2013

Public Can View

Organization: Craters of the Moon National Monument & Preserve
Address: 19 miles West of Arco on Hwy 20/26/93, PO Box 29, Arco, ID 83213

Friday, December 9, 2016 1:18:11 PM

Wednesday, August 9, 2017 4:01:54 PM

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Monday, January 1, 0001 12:00:00 AM

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Scenic