Statements (30)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
granite
|
| gptkbp:chemicalFormula |
CaCO3
|
| gptkbp:cleavage |
perfect in three directions
|
| gptkbp:color |
colorless
|
| gptkbp:crystalSystem |
trigonal
|
| gptkbp:discoveredBy |
17th century
|
| gptkbp:hardnessMohs |
3
|
| gptkbp:hasVariant |
gptkb:calcite
|
| https://www.w3.org/2000/01/rdf-schema#label |
Iceland Spar
|
| gptkbp:luster |
vitreous
|
| gptkbp:notableFor |
birefringence
optical clarity |
| gptkbp:optical_property |
polarization
double refraction |
| gptkbp:refractiveIndex |
1.49–1.66
|
| gptkbp:solubility |
soluble in acids
|
| gptkbp:source |
gptkb:China
gptkb:Iceland gptkb:Mexico gptkb:Peru gptkb:United_States |
| gptkbp:specificGravity |
2.71
|
| gptkbp:streak |
white
|
| gptkbp:transparency |
transparent
|
| gptkbp:used_in |
Vikings (as sunstone for navigation)
|
| gptkbp:usedFor |
optical instruments
demonstrating double refraction polarizing microscopes |
| gptkbp:bfsParent |
gptkb:John_M._Greening
|
| gptkbp:bfsLayer |
8
|