.	Dwarves' Earth Treasures Museum: Petrifed Wood of Arizona	.

    Sometimes in some time ago (usually millions of years), a dead body like a tree would be buried and decomposed leaving behind a cast (hole shaped like a body of a tree) for minerals like quartz/agate to fill in. The Arizona Pefrified Wood are well-known for being most colorful petrifed wood in the world.
    The sequoia-like conifer trees had fallen and got buried in the delta of some big river that eventually got replaced with silica and iron-rich solutions for 200 million years. Iron minerals are reponsible for red, orange, and yellow colors while manganese minerals provides black colors. Green color may be due to nickel minerals.
 

Halbrooke, Arizona (West of National Petrified Wood Park)	Halbrooke, Arizona (West of National Petrified Wood Park)