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Cross section of a fossilized tree, the tree rings now filled with opal.  Water filled cracks & the empty spaces of the petrified wood; the silica content in the water hardened into opal (can also change to chalcedony).  This transformation turned it into fire opal, which is transparent/translucent in a warm range of colors: yellow, orange, orange-yellow or red.  Opal is not a mineral - it is a mineraloid, a mineral like substance that does not demonstrate crystallinity.

Cross section of a fossilized tree, the tree rings now filled with opal. Water filled cracks & the empty spaces of the petrified wood; the silica content in the water hardened into opal (can also change to chalcedony). This transformation turned it into fire opal, which is transparent/translucent in a warm range of colors: yellow, orange, orange-yellow or red. Opal is not a mineral - it is a mineraloid, a mineral like substance that does not demonstrate crystallinity.

Moldavite:+The+Stone+That+Fell+To+Earth

Moldavite:+The+Stone+That+Fell+To+Earth

Google Image Result for http://www.prehistoricplanet.com/images/features/earth/geologictime/geologictime1.jpg

Google Image Result for http://www.prehistoricplanet.com/images/features/earth/geologictime/geologictime1.jpg

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