Monday, April 21, 2014

Petrified Wood

By Abe V Rotor

Petrified wood (Pietro, rock) is a fossil formed by the infiltration of minerals into cavities between and within cells of natural wood, usually by silica (silicon dioxide, SiO2) or calcite (calcium carbonate, CaCO3). Petrification is a very slow anaerobic process.

The replacement of organic tissue by mineral deposits is so precise that the internal structure as well as the external shape is faithfully represented; sometimes even the cell structure may be determined.

Petrified rocks are cut and polished into many items of commerce and art such as furniture, adornments, and decors.~

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