Chromium Chromium Petrified Wood
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Chromium Petrified Wood.
The tag that came with sample reads as follows:
Jurassic, Arizona USA
This wood has been minerally replaced with Chromium giving it a green color. Very little of this wood has ever been found, making it very rare. This wood is a natural hygrometer, when dry it becomes a very light pale green and when wet or exposed to humidity it turns a deep green.

Source: Fossil Image Ltd.
Contributor: Theodore Gray
Acquired: 29 March, 2003
Price: $15
Size: 2"
Composition: Cr