Conk Opal from Virgin Valley District of Nevada USA
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South Dakota, USA
Slab of the ultra rare, precious opalized wood (Opal replacing wood) known as "Conk" Opal from the Virgin Valley of northwestern Nevada USA. Conk is a type of wood where part of the wood was eaten by a fungus. The wood was buried in volcanic ash layers and part of the rot cells were replaced by precious Opal over about 15 million years. Christopher Wentzell Trust collection.
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amorphous silica with water and a spectacular play-of-color; black, boulder, and fire opal varieties capture brightness, color, and collecting appeal.Regional guide
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