Black Smoker Expedition
Very hot sulfur-rich waters coming from volcanic vents in the ocean floor crystallize into chimneys called black smokers. Scientists overcame many challenges to bring a few up, so they could study their formation and the odd things living there.
www.amnh.org/nationalcenter/expeditions/   Kids and Teens: School Time: Science: The Earth: Oceanography  

Earthcore Industries Inc.
Supplier of standard, vent free, and patio fireplaces constructed from Icelandic volcanic stone. Includes specifications and dimensioned drawings.
www.isokern.net/   Business: Construction and Maintenance: Materials and Supplies: Specialties: Fireplaces and Stoves: Fireplaces