Virgin Valley black fire opal
E16228
Virgin Valley black fire opal is a rare and vividly iridescent variety of opal renowned for its dark body color and brilliant play of fire, found primarily in the Virgin Valley region of Nevada.
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
gemstone
→
mineraloid → precious opal → |
| associatedWithLocality |
Humboldt County, Nevada
→
Virgin Valley opal fields → |
| chemicalFormula | SiO2·nH2O → |
| colorVarietyOf | opal → |
| distinguishedBy |
locality in Nevada rather than Australia
→
often higher water content than many Australian black opals → |
| distinguishedFrom |
Opal
→
surface form: "Australian black opal"
|
| foundInCountry |
United States of America
→
surface form: "United States"
|
| foundInGeologicSetting |
opal-bearing volcanic ash beds
→
sedimentary layers with volcanic origin → |
| foundInRegion | Virgin Valley → |
| foundInState | Nevada → |
| hasBodyColor |
black
→
dark → |
| hasColorPlay |
blue
→
green → orange → red → violet → yellow → |
| hasComponent | hydrated silica → |
| hasFormationProcess | precipitation of silica-rich solutions in cavities and fractures → |
| hasNotableProperty |
brilliant play of fire
→
rare occurrence → vividly iridescent appearance → |
| hasOpticalEffect |
iridescence
→
opalescence → play of color → |
| hasPorosity | high → |
| hasStabilityIssue | tendency to craze when dehydrated → |
| hasTypicalUse |
collector gemstones
→
fine jewelry → lapidary specimens → |
| isSoughtBy |
gem collectors
→
lapidaries → mineral enthusiasts → |
| marketCategory | black opal → |
| occursWith |
common opal
→
opalized wood → wood opal → |
| requiresCare |
avoid prolonged exposure to dry heat
→
avoid rapid temperature changes → |
| valuedFor |
contrast between dark body tone and bright color flashes
→
intense multicolored fire → rarity of high-quality stones → |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.