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You can find dwarfs, hobbits, dragons and wizards in the towers created by porphyritic lava flows.

The original porphyritic, fluidal, vesicular or fragmental structures of the igneous rock are clearly visible in the less advanced stages of hornfelsing, but become less evident as the alteration progresses.

At Port St. Julian, the country becomes hilly, and continues so as far to the northward as latitude 44�, the rock being porphyritic.

His marble was perhaps the porphyritic rock which it resembles when wetted by sea moisture.

Those rocks examined microscopically consist of basalts which are often porphyritic.