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and when exposed to the elements over a long period of time can change into the closely related malachite
which over the course of millions of years becomes solid while retaining the semitransparent yellowish hue of tree sap
Metacanthian Trilibite from the Mid Devonian Period
roughly 20 million years ago
A vivid and richly colored copper-based mineral
Tanzanite Fluorite Mimetite and when exposed to the
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