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M918
- Opal, Banded (Utah)
Beautiful multi-colored banding in this
common opal. Hydrous
silica, often with some iron and aluminum. Hardness 5-1/2
to 6-1/2. Opal is a low-temperature mineral and usually develops
in a wide variety of rocks as cavity and fracture fillings.
It frequently develops as amygdules in basalt and rhyolite
of volcanic rock and replaces the cells in wood and the shells
of clams. From Utah. Colors in these specimens include white,
red, orange, yellow, purple, pink and a
variety of these colors. Awesome banding.
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GREAT
VALUE |
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Small: $5.00 each ! |
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Large: $8.50 each ! |
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canalways remove items from your cart later if you wish) |
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