The Blue Lagoon, Iceland. A unique geothermal spa that utilizes the waste seawater from a nearby geothermal power plant. Silica, which is brought directly from the Earth’s mantle, is the most characteristic element in its water, but its waters also contain a unique microbial community, as some 60% of the organisms here are novel on a species level. On a recent recreational visit, I became fascinated by the way that wood that had been in contact with the waters had become siliconized and thus coated in a hard vitreous layer. Could such a siliconized wood composite form a novel BioCeramic building material? Does the unique microbial community play a role in the diposition of slica?