Category:Porphyritic phonolite

Subcategories

This category has only the following subcategory.

Media in category "Porphyritic phonolite"

The following 3 files are in this category, out of 3 total.

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  Pophyritic phonolite (host rock next to Bluebird Dike, Cripple Creek Diatreme, Early Oligocene, 32 Ma; Cresson Pit, Cripple Creek Mining District, Colorado, USA) 3.jpg 3,008 × 2,000; 5.5 MB
  
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  Porphyritic phonolite (Cripple Creek Diatreme, Early Oligocene, 32 Ma; Ironclad area, Cripple Creek Mining District, Colorado, USA) 3.jpg 3,008 × 2,000; 4.96 MB
  
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  Porphyritic phonolite (Eocene, 49 Ma; Devils Tower, northeastern Wyoming, USA) 2.jpg 1,995 × 2,289; 2.44 MB