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.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Virgin Valley black fire opal canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T140275 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Virgin Valley black fire opal Context triple: [Nevada, stateGemstone, Virgin Valley black fire opal]
-
A.
Quartz
Quartz is a digital news outlet known for its global business journalism, data-driven reporting, and mobile-first storytelling.
-
B.
Colorado Yule marble
Colorado Yule marble is a high-quality, pure white marble from Colorado renowned for its use in major U.S. monuments and buildings.
-
C.
Tennessee marble
Tennessee marble is a high-quality, pinkish to gray crystalline limestone from eastern Tennessee widely used as an ornamental building stone in prominent U.S. monuments and architecture.
-
D.
Sikhote-Alin
Sikhote-Alin is a rugged mountain range in the Russian Far East known for its rich biodiversity and as a critical habitat for the endangered Amur tiger.
-
E.
Rano Raraku
Rano Raraku is the volcanic quarry on Easter Island where most of the island’s iconic moai statues were carved and partially erected.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Virgin Valley black fire opal Target entity description: 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.
-
A.
Quartz
Quartz is a digital news outlet known for its global business journalism, data-driven reporting, and mobile-first storytelling.
-
B.
Colorado Yule marble
Colorado Yule marble is a high-quality, pure white marble from Colorado renowned for its use in major U.S. monuments and buildings.
-
C.
Tennessee marble
Tennessee marble is a high-quality, pinkish to gray crystalline limestone from eastern Tennessee widely used as an ornamental building stone in prominent U.S. monuments and architecture.
-
D.
Sikhote-Alin
Sikhote-Alin is a rugged mountain range in the Russian Far East known for its rich biodiversity and as a critical habitat for the endangered Amur tiger.
-
E.
Rano Raraku
Rano Raraku is the volcanic quarry on Easter Island where most of the island’s iconic moai statues were carved and partially erected.
- F. None of above. chosen
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 ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Virgin Valley black fire opal Description of subject: 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.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.