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Reader Submissions: My Igneous Rock


Admit it, rocks are special. The best ones are not just pretty but intriguing, even beautiful. Admit it, you actually like some rocks. Show us one of your favorite igneous rocks. If you don't know what you have, please try posting your pictures in the Forum instead.

Basalt Bombs from Central Oregon

This basalt was molten when it left it's source, a cone who's north face blew in the distant past (est 3 - 5 ma). It sloughed off material in flight (for about two-to-three kilometers) then hit earth…More

Granite Glacial Cobble, New York

I first picked this rock up because it looked igneous and of a good size. It wasn't until I washed it that I noticed the unusual features of the pink and white colors offset by the veins and black cr…More

Rhyolite Clast in Tuff

What I like is the flow banding and the parallel grooves on one of the partly covered sides of the rhyolite. I'm not sure what caused the parallel grooving. Also, although not observable without a ha…More

Brown Streaky Obsidian

While the core of the rock appears to be solid obsidian. The external coating has striations that take on the appearance of petrified wood.I was visiting Paso Robles, California and spent the day at …More

Sodalite Syenite, Brazil

The bright blue crystals of sodalite blew me away! When I first saw this piece, I thought it was a manufactured product because blue rocks are so rare in nature. I pulled out all of my rock reference…More

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