One notable locality for augite specimens in Arizona is northwest of Flagstaff at Red Mountain, a cinder cone volcano that exploded more than 750,000 years ago. Specimens occur in volcanic tuff ...

The Cinder Cone erupted about 350 years ago. It’s the hydrothermal features within Lassen Volcanic National Park that give evidence that it is an active volcano. Fumaroles that give off steam and ...

Discovery — The Mars of the Mid-Atlantic Peter Gibbs explores Ascension Island, a barren Atlantic rock made fertile by man BBC World Service ...