Statements (42)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
gptkb:cryptocurrency
granite |
| gptkbp:associatedWith |
environmental issues
human rights abuses conflict minerals |
| gptkbp:chemicalFormula |
(Fe,Mn)(Nb,Ta)2O6
|
| gptkbp:color |
black
brownish |
| gptkbp:component |
columbite
tantalite |
| gptkbp:containsElement |
gptkb:niobium
tantalum |
| gptkbp:density |
5.2-7.3 g/cm³
|
| gptkbp:discoveredIn |
19th century
|
| gptkbp:exportedTo |
gptkb:Central_Africa
gptkb:China gptkb:Europe gptkb:Japan gptkb:United_States |
| gptkbp:hardnessMohs |
5-6
|
| gptkbp:hasResource |
gptkb:Australia
gptkb:Brazil gptkb:Canada gptkb:China gptkb:Democratic_Republic_of_the_Congo gptkb:Ethiopia gptkb:Mozambique gptkb:Nigeria gptkb:Rwanda |
| https://www.w3.org/2000/01/rdf-schema#label |
coltan
|
| gptkbp:subjectOf |
documentaries
academic research UN investigations ethical sourcing campaigns international trade regulation |
| gptkbp:usedFor |
capacitors
electronics electronic components laptops mobile phones |
| gptkbp:bfsParent |
gptkb:Central_Africa
|
| gptkbp:bfsLayer |
5
|