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Arizona rainbow
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Arizona rainbow

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  • 1. Mystery Object
  • 2. The mystery object is PETRIFIED WOODfrom Arizona.
  • 3. Petrified wood is aspecial type offossil. It has thetree’s originalshape andstructure, but theliving material hasbeen replaced byminerals andstone.
  • 4. Our specimen beganforming millions ofyears ago when logswashed into anancient river or sea.The logs were buriedby great amounts ofsediment, but because there was verylittle oxygen, the logs did not decaynormally.
  • 5. The log broke downvery slowly overhundreds of years.Minerals absorbedinto the wood. Theminerals replacedpieces of the woodas it decayed.
  • 6. Our particular specimenis sometimes called“rainbow” petrifiedwood because of itsmany colors. It is madeof almost solid quartz.Quartz is usually clear,but when elements arein the water/mud duringthe petrification, othercolors are produced.
  • 7. Here is a list of elementsand the colors they mayproduce in the petrifiedwood:• carbon - black• cobalt - green/blue• chromium - green/blue• copper - green/blue• iron oxides - red, brown, and yellow• manganese - pink/orange• manganese oxides - black/yellow
  • 8. Petrified Forest National Park in thePainted Desert of Arizona contains oneof the world’s largest and most colorfulareas of petrified wood.

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