Photographer: Paul S. DoBell II
Image © 2014: PFMA
Description printed on opposite side of bookmark:
PETRIFIED FOREST NATIONAL PARK
Petrified wood, like many rocks and stones, is comprised primarily of the mineral quartz. Quartz or silicon dioxide, as it is called by chemists, is formed of molecules of two atoms of the element oxygen and one atom of the element silicon. Although quartz is colorless in its purest form, petrified wood usually is not because it contains small amounts of other elements which produce a variety of colors.
Bookmark size: 2″ x 6″